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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) ;)

May Strength Circuit and HIIT Cardio

Cardio and Strength Workout "13" for for printable version with exercise instructions

Multiple workouts - Treadmill, elliptical and strength - to shake up your routine

No Equipment Needed Cardio Circuit - this one would be great while traveling, could do in hotel room

Frost HIIT workout. Bodyweight only. Torch calories in only 20 minutes!

Musical Cardio Workout for bike or running

Five-mile treadmill hill workout