9. Try a mini-triathlon
Instead of trying to force yourself to stay on the recumbent bicycle for 45 minutes each time you work out, here's your new plan: 15 minutes power walking on a steep incline on the treadmill, 15 minutes on a stationary cycle (ideally at a high resistance level), then 15 minutes in the pool (or use the racing program on your gym's rowing machine). Be sure to warm up, cool down and stretch, and don't forget to write down your speeds to keep track of your progress. Reward yourself when you reach the finish line!

P.S.: For an added bonus, combine this activity with cardio boost #3 -- working out with a partner -- to make this activity even more fun.
Calorie-burning boost: One workout = 600 calories