This text from "Lower Body Training Tips.pdf" offers advice on optimising leg extension and seated leg curl exercises. For leg extensions, leaning back increases rectus femoris muscle growth by lengthening the muscle. Maximising range of motion is key, achieved by adjusting machine settings or body position. Conversely, for seated leg curls, sitting slightly forward lengthens the hamstrings, improving muscle growth in the heads that cross the hip. Maintaining continuous tension throughout the exercise is crucial for both movements.