Mighty Nimble
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Seb's Epic Marathon Strength

A very challenging, heavy strength and power session tailored for Seb—built to drive full-body strength while respecting low back pain.

General Warm-Up

Easy pace; breathe through your nose if possible.

Row Erg
Row Erg4 min
How to

A seated rowing machine movement that trains your legs, back, arms, and cardio.

  1. Sit tall with feet strapped in and hands on the handle.
  2. Start with knees bent, arms straight, and chest up.
  3. Push through your legs, then lean back slightly and pull to your ribs.
  4. Extend your arms, hinge forward, then bend your knees to slide back.
  5. Repeat with a smooth, steady rhythm.
Form cues
  • Drive with your legs first.
  • Keep your chest tall.
Common mistakes
  • Pulling with your arms before your legs.
  • Rounding your back as you reach forward.
30 sec rest

Mobility Flow

Smooth reps; don't force end ranges.

World’s Greatest Stretch
World’s Greatest Stretch4x each side
How to

A dynamic lunge stretch that opens your hips, hamstrings, and upper back as you alternate sides.

  1. Start in a high plank with hands under shoulders.
  2. Step your right foot outside your right hand.
  3. Drop your hips, then rotate your right arm up toward the ceiling.
  4. Place your hand down and step back to plank.
  5. Repeat on the left side, alternating sides each rep.
Form cues
  • Keep your front foot flat.
  • Reach long through your top hand.
Common mistakes
  • Letting your front heel lift off the floor.
  • Rushing the rotation without control.
Leg Swing
Leg Swing10x each side
How to

A dynamic leg swing that warms up your hips, hamstrings, and glutes while challenging balance.

  1. Stand tall and hold a wall or rail for light support if needed.
  2. Lift one leg slightly off the floor with a soft knee.
  3. Swing it forward and back with control.
  4. Set it down, then switch legs on the next rep.
Form cues
  • Keep your torso tall.
  • Swing from the hip, not the low back.
Common mistakes
  • Leaning back as the leg swings forward.
  • Forcing the range of motion.
2 rounds · 10 sec rest
30 sec rest

Glute and Core Activation

Brace hard; keep ribs down and pelvis neutral.

Glute Bridge
Glute Bridge12x
How to

A floor hip lift that trains your glutes and hamstrings with both feet planted.

  1. Lie on your back with knees bent and feet flat, hip-width apart.
  2. Brace your core and press your arms lightly into the floor.
  3. Drive through your heels and lift your hips until your body forms a straight line.
  4. Squeeze your glutes at the top, then lower with control.
  5. Repeat for your reps.
Form cues
  • Keep your ribs down
  • Drive through your heels
Common mistakes
  • Arching your lower back at the top
  • Pushing through your toes
Dead Bug
Dead Bug8x each side
How to

A core move on your back that trains control while you move opposite arm and leg.

  1. Lie on your back with arms up and knees bent over hips.
  2. Press your lower back gently toward the floor.
  3. Lower one arm and the opposite leg with control.
  4. Return to the start, then repeat on the other side.
  5. Keep alternating sides for each rep.
Form cues
  • Move slow and stay braced
  • Keep your ribs down
Common mistakes
  • Letting your lower back arch
  • Rushing through the reps
2 rounds · 10 sec rest

Power Primer

Jump high; stick the landing softly.

Box Jump
Box Jump3x
How to

A two-foot jump onto a box that trains explosive leg power and landing control.

  1. Stand facing the box with feet hip-width apart.
  2. Dip your hips and swing your arms back.
  3. Jump with both feet and land softly on the box.
  4. Stand tall on the box, then step down with control.
  5. Repeat for reps.
Form cues
  • Land with knees tracking over toes.
  • Use your arms to help drive up.
Common mistakes
  • Landing stiff-legged on the box.
  • Jumping down if you cannot control it.
5 rounds · 45 sec rest
1m 30s rest

Heavy Front Squat

RPE 8–9. Full-body tension; elbows high.

Barbell Front Squat
Barbell Front Squat3x
How to

A squat with the load held in front. It trains your quads, glutes, and core.

  1. Hold the weight at the front of your shoulders or chest.
  2. Stand with feet about shoulder-width apart, toes slightly out.
  3. Brace your core and keep your chest tall.
  4. Bend knees and hips to squat down under control.
  5. Drive through your feet to stand back up.
Form cues
  • Keep elbows high
  • Knees track over toes
Common mistakes
  • Letting your chest drop forward
  • Heels lifting as you squat
5 rounds · 45 sec rest

Trap Bar Deadlift — Strength

RPE 8. Reset each rep; no touch-and-go.

Trap Bar Deadlift
Trap Bar Deadlift2x
How to

A deadlift using a trap bar that trains your glutes, hamstrings, back, and grip.

  1. Stand inside the bar with feet hip-width and handles beside your legs.
  2. Hinge at your hips and bend your knees to grip the handles.
  3. Brace your core, keep your chest up, and push the floor away to stand.
  4. Lock out tall without leaning back.
  5. Hinge and bend your knees to lower the bar with control.
Form cues
  • Keep the bar path straight
  • Drive through your whole foot
Common mistakes
  • Rounding your back as you lift
  • Leaning back hard at the top
6 rounds · 45 sec rest
2 min rest

Trap Bar Deadlift — Speed Reps

Lighter load; move fast with perfect form.

Trap Bar Deadlift
Trap Bar Deadlift2x
How to

A deadlift using a trap bar that trains your glutes, hamstrings, back, and grip.

  1. Stand inside the bar with feet hip-width and handles beside your legs.
  2. Hinge at your hips and bend your knees to grip the handles.
  3. Brace your core, keep your chest up, and push the floor away to stand.
  4. Lock out tall without leaning back.
  5. Hinge and bend your knees to lower the bar with control.
Form cues
  • Keep the bar path straight
  • Drive through your whole foot
Common mistakes
  • Rounding your back as you lift
  • Leaning back hard at the top
6 rounds · 30 sec rest

Weighted Pull-Up Focus

If unweighted, choose a hard variation; full hang each rep.

Pull Up
Pull Up5x
How to

A bodyweight upper-body pull that trains your back, shoulders, and arms.

  1. Grip the bar with hands just wider than shoulder width.
  2. Hang with arms straight and brace your body.
  3. Pull your chest toward the bar by driving elbows down.
  4. Pause briefly at the top with chin over the bar.
  5. Lower with control until your arms are straight again.
Form cues
  • Keep your ribs down
  • Lead with your chest
Common mistakes
  • Kicking your legs to start the pull
  • Shrugging your shoulders toward your ears
5 rounds · 45 sec rest
1m 30s rest

Heavy Bench Press

RPE 8–9. Tight upper back; controlled descent.

Barbell Bench Press
Barbell Bench Press4x
How to

A chest press lying on a bench that trains your chest, shoulders, and triceps.

  1. Lie on the bench with eyes under the bar and feet flat.
  2. Grip the bar just wider than your shoulders.
  3. Unrack the bar and hold it over your chest with arms straight.
  4. Lower the bar to your mid-chest with control.
  5. Press the bar back up until your arms are straight.
  6. Finish your reps, then rack the bar carefully.
Form cues
  • Keep your shoulder blades pulled back.
  • Drive your feet into the floor.
Common mistakes
  • Bouncing the bar off your chest.
  • Flaring your elbows straight out.
5 rounds · 45 sec rest

Bulgarian Split Squat

Go heavy but stable; knee tracks over toes.

Bulgarian Split Squat
Bulgarian Split Squat6x each side
How to

A rear-foot-elevated split squat that trains your quads, glutes, and balance.

  1. Stand a stride in front of a bench or step, facing away.
  2. Place the top of one foot on the bench behind you.
  3. Bend your front knee and lower until your back knee moves toward the floor.
  4. Press through your front foot to stand tall again.
  5. Finish your reps, then switch legs.
Form cues
  • Keep your chest up.
  • Keep your front knee tracking over your toes.
Common mistakes
  • Pushing off the back foot too much.
  • Letting your front knee cave inward.
4 rounds · 30 sec rest
1m 30s rest

Barbell Hip Thrust

Pause 1 second at the top; ribs down.

Barbell Hip Thrust
Barbell Hip Thrust6x
How to

A glute-focused bridge with your upper back raised. It trains your glutes and hips.

  1. Sit with your upper back on a bench and feet flat, hip-width apart.
  2. Brace your core and tuck your chin slightly.
  3. Drive through your heels and lift your hips until your body forms a straight line.
  4. Squeeze your glutes at the top without arching your back.
  5. Lower your hips with control and repeat.
Form cues
  • Keep your ribs down
  • Drive through your heels
Common mistakes
  • Arching your lower back at the top
  • Pushing through your toes instead of your heels
4 rounds · 30 sec rest

Kettlebell Swing Intervals

Explosive hips; neutral spine; stop if back tightens.

Kettlebell Swing
Kettlebell Swing15x
How to

A two-hand kettlebell swing that trains your glutes, hamstrings, hips, and core.

  1. Stand with feet hip-width and the kettlebell on the floor in front of you.
  2. Hinge at your hips, grip the handle, and hike it back between your legs.
  3. Snap your hips forward and let the kettlebell swing to chest height.
  4. Let it fall, hinge again, and keep the swings smooth.
  5. To finish, guide it back to the floor in front of you.
Form cues
  • Keep your back flat
  • Drive the swing with your hips
Common mistakes
  • Squatting instead of hinging
  • Lifting the kettlebell with your arms
8 rounds · 30 sec rest
1m 30s rest

Farmer Carry

Heavy carries; tall posture; slow controlled steps.

Farmer Carry
Farmer Carry40 sec
How to

A loaded walk that trains your grip, core, shoulders, and posture.

  1. Stand tall with a weight in each hand at your sides.
  2. Brace your core and pull your shoulders down and back.
  3. Walk forward with short, controlled steps.
  4. Keep the weights steady and your torso upright.
  5. Set the weights down with control when finished.
Form cues
  • Stand tall as you walk
  • Keep the weights by your sides
Common mistakes
  • Leaning back or to one side
  • Letting the weights swing
6 rounds · 30 sec rest

Overhead Press — Heavy

RPE 8. Squeeze glutes; don't lean back.

Barbell Overhead Press
Barbell Overhead Press4x
How to

A standing press that trains your shoulders, triceps, and upper back.

  1. Stand tall with your feet hip-width apart and weights at shoulder height.
  2. Brace your core and keep your ribs down.
  3. Press the weights overhead until your arms are straight.
  4. Lower the weights with control back to your shoulders.
  5. Repeat for the set.
Form cues
  • Keep your wrists stacked over elbows.
  • Press straight up, not forward.
Common mistakes
  • Leaning back as you press.
  • Shrugging your shoulders toward your ears.
5 rounds · 45 sec rest
1m 30s rest

Dumbbell Row — Strict

Brace with one hand on bench; pull elbow toward hip.

Dumbbell Row
Dumbbell Row8x each side
How to

A bent-over pulling move that trains your upper back, lats, and arms.

  1. Hold a dumbbell in each hand and hinge at your hips.
  2. Let your arms hang under your shoulders with palms facing in.
  3. Pull both elbows up toward your ribs.
  4. Pause briefly, then lower the dumbbells with control.
Form cues
  • Keep your back flat
  • Pull elbows close to your sides
Common mistakes
  • Shrugging your shoulders toward your ears
  • Using your torso to swing the weights
4 rounds · 30 sec rest

Section 7 — Core Anti-Rotation

Trunk stability for running economy and back resilience. Lateral chain focus.

Pallof Press
Pallof Press10x each side
How to

An anti-rotation core hold that trains your abs and obliques to resist twisting.

  1. Stand sideways to an anchor with the handle at chest height.
  2. Hold it at your chest with both hands and step out to create tension.
  3. Brace your core and press your hands straight forward.
  4. Hold the position and breathe slowly without letting your torso turn.
  5. Bring your hands back to your chest with control.
Form cues
  • Keep your ribs down
  • Stay tall and square
Common mistakes
  • Letting your torso rotate
  • Shrugging your shoulders
Side Plank
Side Plank35 sec each side
How to

A side hold that trains your obliques, hips, and shoulder stability.

  1. Lie on one side with your elbow under your shoulder and legs stacked.
  2. Lift your hips until your body forms a straight line.
  3. Hold the position and breathe steadily.
  4. Lower your hips with control.
  5. Finish your hold, then switch sides.
Form cues
  • Keep your hips stacked
  • Press the floor away
Common mistakes
  • Letting your hips sag
  • Rolling your chest toward the floor
3 rounds · 15 sec rest

Cool-Down

Bring heart rate down and reduce stiffness in hips/hamstrings/back. Downshift and mobility focus.

Child’s Pose
Child’s Pose1 min
How to

A kneeling rest pose that gently stretches your back, hips, and shoulders.

  1. Kneel on the floor with your big toes together and knees apart.
  2. Sit your hips back toward your heels.
  3. Fold forward and reach your arms in front of you.
  4. Rest your forehead down and let your chest sink between your thighs.
  5. Hold the position and breathe slowly.
Form cues
  • Relax your shoulders
  • Breathe into your back
Common mistakes
  • Forcing your hips down
  • Holding your breath
Hamstring Stretch
Hamstring Stretch1 min each side
How to

A held stretch for the back of your thigh that targets your hamstrings.

  1. Sit tall with your target leg straight and toes up.
  2. Hinge at your hips and reach toward your foot.
  3. Stop when you feel a gentle stretch behind your thigh.
  4. Hold the stretch and breathe slowly.
  5. Release slowly, then switch sides if stretching one leg.
Form cues
  • Keep your back long.
  • Hinge from your hips.
Common mistakes
  • Rounding your back to reach farther.
  • Bouncing in the stretch.
Why These Exercises Were Chosen

Why These Exercises Were Chosen

Each exercise targets specific muscle groups and movement patterns matched to the demands of your discipline. The selection balances agonist-antagonist pairs, stabilizer engagement, and energy system development to build functional capacity that transfers directly to performance.

Built Around How Your Body Works

Built Around How Your Body Works

Your routine reflects the biomechanical and physiological demands of your goal. Joint angles, contraction types, and loading patterns are chosen to strengthen exactly the positions and forces your body encounters during your activity.

Structured for Long-Term Adaptation

Structured for Long-Term Adaptation

Set and rep schemes follow progressive overload principles, giving your tendons, muscles, and nervous system the stimulus they need to adapt. Adjust load and rest periods as movements become easier to keep driving improvement.

Seb's Epic Marathon Strength | Mighty Nimble | Mighty Nimble