Duh! This is my very favourite fitness-related thing. The Bosu is my favourite fitness toy / tool. I use it in so many sessions, because I am a firm (pun intended) believer that stability work, combined with some soft-landing plyometrics, is the fastest way to get a hard body that is endurable from the inside-out.
If you have a Bosu, with proper guidance you can do an amazing full-body workout with strictly bodyweight - no dumbbells required. Stability challenges require optimal muscle recruitment, and strengthen those suckers right down to the bone. Read: you will achieve a strong, long-lasting and compact body.
And when you need guidance, you contact my team! We're standing by and ready to kick your butts in 2014.