Weight Weight... Don't Tell Me — Once you’ve become comfortable with adding weights to your treadmill routine, Mario suggests bringing your speed back up. Yes, sprinting with weights can seem crazy, so we can't stress enough that you should work up to it. You don't want to risk a broken leg, or head-to-toe bruises...or both.  

Free Weight Treadmill With Speed Trial: Follow the beginner interval plan, but add 30 seconds of shadow boxing within each circuit, followed by a 20 to 30 second sprint with the weights in hand to propel your run and challenge your core, and then followed by a 20 to 30 resting speed interval. Be forewarned, this one is a challenge!

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