Exercise guide
Peterson Forward Side Step
- Intermediate
- Compound
- Rep-based
- Hips
- Lower legs
The Peterson Forward Side Step is a specialized unilateral movement designed to isolate the VMO (inner quadriceps) and improve knee stability by combining ankle dorsiflexion with terminal knee extension.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Stand with your working foot on a 4-6 inch step or elevated block.
- Position the working foot so the heel is free to lift or slightly elevated, with the non-working leg hanging off the side.
- Maintain an upright posture with your hands on your hips or held out for balance.
How to do it
- Inhale and slowly lower your non-working leg forward and slightly out to the side at a 45-degree angle.
- Allow the heel of the working foot to rise as you descend, keeping the weight on the ball of the foot to maximize VMO activation.
- Lightly touch the heel of the non-working foot to the floor without shifting any body weight onto it.
- Exhale and push through the ball of the working foot to return to the start, fully locking out the knee at the top.
Form checklist
- Keep the working knee tracking directly over the second toe.
- Maintain a vertical torso throughout the entire range of motion.
- Ensure the non-working leg remains straight as it reaches for the floor.
- Avoid 'bouncing' the heel off the ground; use a slow, controlled 3-second eccentric phase.
Pro tips
- Focus on a hard contraction of the inner quad (VMO) at the very top of the movement.
- Maintain a 'proud chest' to prevent the hips from hinging backward, which shifts tension away from the quads.
Make it harder
- Increase the step height to 8-10 inches to demand greater range of motion and ankle mobility.
- Hold a light dumbbell in the hand opposite the working leg to add load and challenge lateral stability.
Frequently asked
- What muscles does the peterson forward side step work?
- The peterson forward side step primarily targets the calves, glutes, and quadriceps, and also works the adductors, hamstrings, and hip flexors as secondary muscles.
- What equipment do you need for the peterson forward side step?
- The peterson forward side step requires no equipment — just your body weight.
- Is the peterson forward side step good for beginners?
- The peterson forward side step is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.
Related exercises
- Alternate Forward Step Arm SwingIntermediate · calves, glutes, and quadriceps
- Arms Up Rotational Side StepIntermediate · calves, glutes, and quadriceps
- Back Shuffle Side KickoutIntermediate · calves, glutes, hamstrings, and quadriceps
- Barbell Band Assisted DeadliftIntermediate · calves, glutes, hamstrings, quadriceps, and trapezius