Of course I remember - I still use them all the time.

This is a good workout for legs:



And this is good for abs:



And it's always fun to throw in a push up challenge:



I keep them all on one of my Pinterest Boards: http://www.pinterest.com/brdgtc/gym-rat/

A good strategy is to start by doing the leg workout one time and the ab time one time, three times a week - then start to increase until you are doing each 5 times three times a week - I really saw results. If you do them at a brisk pace the final workout takes about an hour and you are really working up a sweat.