These Are the 14 Low-Impact Isometric Exercises Trainers Recommend to Build Strength

Malek said doing wall sits prior to quad-dominant exercises, like squats, is a great way to warm up because you're holding a position with "less joint compression and greater muscle recruitment."

• Stand with your back against a wall. Your feet should be hip-width distance apart or a tad closer.
• Bending your knees, slide your back down the wall until your knees are at 90-degree angles.
• Your knees should be over your ankles as you hold this position.
• Malek suggests holding the wall sit for 20 to 60 seconds.