Just curious what everyone's favorite interval workouts look like.
The only interval workout I do is a spinvervals DVD. It has 3 x 6 minutes (hard), 6 x 1 minutes (harder) and 4 x 30 seconds (super hard!--sorry, that's the best I can describe it).
I sometimes do hill repeats too. But I prefer to do a gravel road ride near us that has lots and lots of hills--I like the variety.

