INCHWORM

The inchworm is a bodyweight dynamic movement that transitions from a standing forward fold into a high plank and back, using the hands to "walk" the body out and in. It is used primarily as a warm-up or mobility drill, stretching the hamstrings and calves while activating the shoulders, core, and hip flexors that stabilize the plank. Because it requires no equipment and moves through a large range of motion, it is a common choice for pre-workout activation and full-body movement prep. Adding a push-up at the bottom of the plank turns it into a more demanding strength-and-mobility combination.

Muscles Targeted

• Primary: Hamstrings, core (rectus abdominis and obliques), shoulders (anterior deltoids)
• Secondary: Chest, triceps, hip flexors
• Tertiary: Calves, lower back (isometric stabilization during the plank)

Starting Position

Stand tall with your feet hip-width apart and arms at your sides. Brace your core and keep a soft bend in your knees before you begin the movement, with your weight balanced evenly across both feet.

Execution Steps

1. Hinge at the hips and fold forward, reaching your hands toward the floor while keeping your legs as straight as comfortable
2. Walk your hands forward step by step until your body forms a straight line from head to heels in a high plank
3. Hold the plank briefly, keeping your wrists stacked under your shoulders and your core braced to prevent your hips from sagging
4. Walk your feet toward your hands, keeping your legs straight and your hips lifted, stopping when your hamstrings feel a firm stretch
5. Roll up through your spine one vertebra at a time to return to standing
6. Repeat for the desired number of reps, moving at a controlled, deliberate pace

Form Cues

• Keep the plank hips level: Don't let your hips sag or pike up as you walk your hands out
• Straight legs, not locked knees: Keep tension in the hamstrings without hyperextending the knees
• Walk in small steps: Short, controlled hand and foot steps keep the movement smooth and prevent loss of balance
• Brace before you plank: Engage your core each time you reach the top plank position to protect your lower back
• Breathe through the movement: Exhale as you walk out, inhale as you walk back toward your feet

Common Mistakes

• Letting the hips sag in the plank: This shifts stress into the lower back instead of the core and shoulders. Keep a straight line from head to heels.
• Bending the knees excessively during the walk-out: This removes the hamstring stretch that is a key benefit of the exercise. Keep legs as straight as comfortable.
• Rushing the movement: Moving too quickly turns the inchworm into a sloppy crawl rather than a controlled mobility drill. Slow down each phase.
• Taking oversized steps: Long strides with the hands or feet reduce control and increase the chance of losing balance.
• Rounding the back when standing back up: Stand up by rolling through the spine rather than yanking the torso upright.

Variations

• Inchworm with push-up: Add a push-up at the bottom of the plank to increase upper body strength demand
• Inchworm with shoulder tap: Add alternating shoulder taps in the plank to increase core anti-rotation work
• Walking inchworm: Continue walking the feet past the hands to travel forward instead of returning to the start
• Single-leg inchworm: Perform the walk-out with one leg lifted to increase core and hip stability demand
• Inchworm to knee push-up: A regressed version using knees during the push-up phase for beginners

Tips for Progression

• Increase reps or duration: Build from 5-8 reps toward 10-12 reps or 30-45 seconds of continuous work
• Add a push-up: Once the base movement is smooth, insert a push-up at the plank to add strength work
• Slow the eccentric: Take extra time walking the hands out to deepen the hamstring stretch
• Increase range: Progress from bent knees to fully straight legs as hamstring flexibility improves

Training Notes

Use the inchworm as a dynamic warm-up before lower body or full-body training, or as a mobility finisher, 2-4 times per week. Perform 5-10 reps for 1-2 rounds, resting as needed between rounds since the focus is mobility and activation rather than fatigue. It pairs well with other dynamic warm-up drills like leg swings and walking lunges.