The 3 quick machine free cardio workouts below prove that you don't need lots of time or a fancy treadmill, elliptical trainer, or bike to burn calories, burn fat, get fit and look great. The cardio workouts are 10, 15, and 20 minutes long and can be done just about anywhere so they're great for busy people or those who travel often.

10 Minute Home/Hotel Room Cardio Workout
This workout is only 10 minutes and requires zero equipment. It's great for quick fat blasting and boosting endurance and energy. Perform each exercise listed below for 60 seconds. Move from one to the next without resting. If you want to make the workout longer take a 1 minute break then go through the circuit again. If you don't know these exercises then simply click the link to see the animated version of this cardio circuit. The animated circuit does require a medicine ball but you can substitute with a dumbbell, basketball, or small travel bag full of clothes.

Straight Leg Quick Feet
8 Count Bodybuilders
Power Jacks
Single Leg Lateral Hops
Mountain Climbers
Plyometric Push-ups from the knees
Standing single leg diagonal wood chop

15 Minute Courts/Parks Cardio Workout
This workout is only 15 minutes long and requires a basketball court, tennis court, soccer field or a big backyard with grass, a jump rope and a basketball or soccer ball. It's great for burning calories and building muscular endurance and balance. Start by jumping rope for 30 seconds to warm-up. Do one set of walking lunges the length of your basketball court or soccer field, or the longest part of your backyard. Jog backwards from there. Dribble your basketball (with hands) or soccer ball (with feet) the length of the court, field, or yard and jog backwards. Jump rope for 1 minute. Do one set of walking lunges the length of your court, field, or yard but this time lunge on the way back as well. Dribble your basketball or soccer ball there and back. Jog there and backwards back. Now you're ready for the big finish. Do side step runs back and forth then rest just long enough to catch your breath then just do regular suicide runs there and back and you are finished.

20 Minute Track & Field Cardio Workout
This workout is about 20 minutes long and requires a track with field plus stadium stairs or bleachers of some kind. You also need a large towel or yoga mat. Your nearest college, high school or middle school probably has a great track. This workout is great for blasting fat and building a lean lower body and tight abs. Click the links if you need instruction on how to do the ab exercises. You'll have to scroll down a bit to see the animation.

warm-up walk 2 laps, jog 1 lap, walk 1 lap
interval 1: run up and down one set of stairs
interval 2: belly blaster 30 seconds single leg plank raise 30 seconds
interval 3: walk 1 lap jog 1 lap
interval 4: run up and down stairs rest long enough to catch your breath repeat
interval 5: belly blaster 30 seconds single leg plank raise 30 seconds
interval 6: run 1 lap walk 1 lap run 1 lap
interval 7: walk up stairs two steps at a time twice (one step at a time only when coming down)
interval 8: belly blaster 60 seconds single leg plank raise 60 seconds
interval 9: walk 1 lap
interval 10: heel to glute quad stretch + wide leg bent over hamstring stretch

Boost workout productivity even more with these great running shoes and comfy training pants. Both great picks for random acts of cardio!
ASICS® Women's GT-2120 Trail shoes provide awesome support and traction for mixed terrain workouts.

Fit Couture Santa Fe fitness and yoga shorts come in 5 different trim colors and provide just enough leg room to run, sprint, lunge, plus enough coverage for floor work including planks, pushups, and ab work.