Leg Extension

QuadsGym Machine

The seated leg extension isolates and targets your quadriceps. It builds front-thigh strength and boosts endurance for leg-dominant movements.

How to do it

1Sit back in the machine. Align your knees with the pivot point and set the lower pad just above your ankles. Adjust the backrest so your spine is flat and thighs stay glued to the seat.

2Grip the handles firmly for stability and take a deep breath.

3Exhale as you extend your legs in a smooth, controlled motion. Fully straighten your knees without locking them out or snapping the joint. Squeeze your quads hard.

4Pause at the top for a second, maxing out quad contraction.

5Inhale as you lower the weight back down slowly under tension. Never let the stack slam.

6Repeat for your target rep count.

Common mistakes

Going too heavy, forcing you to jerk the weight or lift your hips off the seat. This reduces quad engagement and strains joints.

Dropping the weight fast instead of controlling the negative phase. Control both ways to keep tension on the muscles.

Cutting the range of motion short. Work through full extension and flexion without hyperextending your knees.

Misaligning the machine's pivot point with your knee joint, placing unnecessary stress on the knees.

Breathing

Breathe steadily. Exhale as you extend your legs on the push; inhale as you return to the start.

Make it harder or easier

To make it easier: reduce the weight and focus on slow, controlled reps, or execute single-leg extensions.

To make it harder: bump up the weight or add a 1-2 second pause at peak contraction at the top. Single-leg reps also work great.

Listen to your body: if you feel knee discomfort, re-check your setup and lighten the load. Form beats weight every time.

This is general guidance, not a medical opinion. Listen to your body: if it hurts, stop. If you have an injury or a chronic condition, talk to a doctor first.