The fitness industry is a cross current of trends, scams, and classicists who stick to tried and true methods. The “experts” are constantly re-evaluating what exercises you should, and shouldn’t do, labeling the “bad” ones as non-functional and contraindicated.
It’s almost always bull. Here’s a great posting from a great fitness educator, about the leg press machine:
http://www.t-nation.com/free_online_article/most_recent/is_the_leg_press_worthless

