You know what's a really good workout? A nice, fun way to exercise?
Answer: a prolonged, extensive BDSM session
Lots of impact and some roleplay, bondage, gear/slave positioning this way and that way....
Some S&M sessions can truly put you through your paces, especially for the Dominant. Typically you submissives do the enduring while we Masters and Mistresses do the work (I'm referring to heavy spanking and flogging kinds of sessions, specifically in this case). The submissives sweat it out in their own ways but The Ones Calling The Shots take on their own physical workloads too.
Sessions that involve heavy punishments can be invigorating for all involved parties. Sometimes in unexpected (but practical!) ways.
If you're ever looking to change things up with your workout, consider grabbing a submissive and taking your aggression out on them. Push-ups, crunches, weights, flog a slave for a while, some running...... The fitness experts say that you're supposed to create varied programs for yourself so there you go.