So be an intrepid gym bunny (or seek out a BOSU at your local sport or discount store)!
On that note, I have just started reading Dr Susan Jeffers "Feel The Fear...And Do it Anyway" and I'm determined to apply that mindset as broadly as I can. Come with me.
The BOSU looks like a half-ball and it is intended to provide an instable surface so that you are forced to use your core stabiliser muscles (abdominals, glutes and back) to maintain your balance. BOSU Squats: you can do these on the round or flat surfact of the ball
Mountain climber: Gripping either side of the flat surface, keep your body in a plank position. Without raising your hips, pull one knee towards your chest, sucking your belly in. Alternate legs. Keep your eyes ahead and avoid dropping your head down!