Don't just do leg raises, do leg presses! The difference between the two is like the difference between a good joke and a bad joke. One's got a point, the other just gets old.
Try it for yourself: stand on your toes, bend your knees, and push your heels back towards the ground. You'll be squatting like a pro in no time!
Next, check out Tip 4: Deadlift Like You Mean It for more leg-tastic tips!