More to explore:
Halloween Hill Cardio Workout
Do this workout 3-4 days a week for quick transformation.
HIIT the Hill Workout. A killer treadmill workout to increase fitness, endurance, and also challenge different leg muscles (they'll be POPPIN' in your summer shorts) ;)
Cardio and Strength Workout "13" for 2013...click for printable version with exercise instructions
Quick and steady cardio workout
No Equipment Needed Cardio Circuit - this one would be great while traveling, could do in hotel room
the best research-based HIIT methods, all in one spot
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"Hop to it" jumping cardio interval workout. You can do it anywhere with your own body weight + a timer. No excuses, play like a champion ;)
Musical Cardio Workout for bike or running
Frost HIIT workout. Bodyweight only. Torch calories in only 20 minutes!
Cardio Tabata Superset Workout - this is a sweaty one!
I'm so going to do this! Can't wait to see the looks on the drivers' faces going by LOL