Exercise guide
Lying Isometric Quad Hold
- Beginner
- Isolation
- Timed hold
- Lower legs
- Upper legs
This unilateral isolation exercise builds foundational quadriceps strength and knee stability by maintaining maximal tension without joint movement. It is particularly effective for improving mind-muscle connection with the vastus medialis and rehabilitating the knee joint.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Lie flat on your back on a firm surface with both legs fully extended.
- Place your arms by your sides for support and engage your core to press your lower back into the floor.
- Keep your toes pointed toward the ceiling and your ankles in a neutral position.
How to do it
- Contract your quadriceps to lock the knee of the working leg completely straight.
- Lift the heel approximately 2-4 inches off the ground while maintaining a rigid leg.
- Hold this position for the prescribed duration while breathing deeply and steadily.
- Lower the leg under control, rest briefly, and repeat before switching sides.
Form checklist
- Keep the knee of the working leg fully locked out with no micro-bend.
- Ensure the lower back remains in constant contact with the floor.
- Keep the non-working leg flat on the ground or bent with the foot flat for stability.
- Maintain a consistent respiratory rhythm and avoid holding your breath.
Pro tips
- Focus on squeezing the 'teardrop' muscle (VMO) just above the inside of the knee for maximum stability.
- Imagine you are trying to push the back of your knee through the floor immediately before lifting the heel.
Make it harder
- Increase the duration of the hold or perform the exercise with a light ankle weight.
- Perform the hold at a slightly higher elevation (6-8 inches) to increase the demand on the hip flexors.
Frequently asked
- What muscles does the lying isometric quad hold work?
- The lying isometric quad hold primarily targets the quadriceps, and also works the abs and obliques as secondary muscles.
- What equipment do you need for the lying isometric quad hold?
- The lying isometric quad hold requires no equipment — just your body weight.
- Is the lying isometric quad hold good for beginners?
- Yes. The lying isometric quad hold is a beginner-friendly movement and a strong foundation to build on.