KrisCross Training

If your concerned about your joints during interval training here are some great interval workouts that are easier on your joints: http://blog.myfitnesspal.com/rethink-your-run-a-brand-new-approach-to-interval-running-plus-a-12-minute-treadmill-routine/

Rethink Your Run: A Brand-New Approach to Interval Running (Plus, a 12-Minute Treadmill Routine) Add a few minutes of high intensity interval training (HIIT) to your run, and yes, you'll zap calories—fast. But you don't have to reach gasping-for-air breathlessness to reap the fat-torching bene...