I've decided to try to tone up a little. My upper arms are starting to get some flappy fat, and it's gotta go. So I pulled out the old FitDeck, and am alternating this with training rides in the morning. Logistically, the gym is impossible for me, and I don't have room for any equipment in the house. The exercises in FitDeck require no equipment, but the workout is challenging. So it's a nice little product for me (not a paid endorsement; in fact, if they saw my body they'd probably ask me not to mention that I use their product).
I just started on Tuesday, and my legs are crazy sore today. I think what did it is "The Chair". You put your back against the wall, and lower your body until your quads are parallel to the floor. Hold until your eyes pop out of your head. Try it, you'll like it.