Identify the movement
A leg extension straightens the knee against a pad on the front of the lower leg. It differs from a seated leg curl, which bends the knee, and a seated leg press, which uses a footplate. Begin with the machine placard and a staff demonstration of its controls and exit.
Align the seat and knee
The Life Fitness Axiom operation manual describes adjusting the back pad so the knee joint aligns with the machine pivot. Sit against the backrest with thighs supported. Controls differ by model. If you cannot achieve a comfortable fit, ask for help or choose another exercise rather than forcing the position.
Place the lower leg pad
On the Axiom model, the roller sits comfortably above the ankle against the front of the lower leg. It is not the back roller or thigh restraint of a curl machine. Check the adjustment before loading and use the intended side handles. Follow your own model's instructions rather than copying the illustration's exact angle.
Use a controlled repetition
Choose resistance you can control without lifting away from the backrest. The manufacturer describes extending almost fully without locking the knees, then returning under control without resting the resistance on the stack. Mayo Clinic's strength training guidance emphasizes technique and stopping if an exercise hurts. Individual restrictions take priority.
Record the setup that fits
Note the machine model, seat and pad settings, load and controlled repetitions for your next visit. A record does not assess form or prove a result. Use the beginner gym guide to organize your visit and the equipment comparison for broader choices. Explore Fitonomy for training support, and ask a qualified professional about pain or uncertainty.