No such thing as too much variety

Mixing up your exercise type is generally a good thing. I try to think of my exercise routine like a stack of cards that tells me what to do. Remember Nike's Bo Jackson cross-training campaign from the 1990s? Well, being a good all-arounder is still a good thing in 2010.

I have some overall categories like "heavy lifts" or "fast cardio," but some are a mix like "circuit of pushups, sit-ups, dips, crunches and jumping rope." Today, I just did as many pushups as I can do in three minutes followed by 100 burpees, no limit to rest.

Some easy ways to add variety. Switch the number of reps or to a timed set or make up a circuit of your favorite exercise. Do a yoga routine.

Just try to do very different types of exercises on consecutive days. So use common sense. If you just did something that heavily involves taxing the back, don't do rows the next day for example. Change it up so you don't get bored or burnt out. It's also very good to hit different aspects of fitness.

By the way. 100 burpees are tough. I feel completely spent.