Sit in an angled leg press machine and place your feet near the outer edges of the footplate with your toes pointed out 45 degrees. Unhook any safety stoppers and support the weight with your legs. Slowly lower the weight, bringing your knees toward your chest but stopping when your knees are at 90 degree angles. Pause a moment before pressing through your heels to return the weight to the start position at full leg extension but without locking out at the knees.