When you don't have a lot of time to devote to a workout,you gotta produce every minute count! Choose one of these heart-pumping, muscle-building exercises and give it all you've got for the designated number of minutes, or you'll burn 300 calories. Kettlebell training: 15 minutes
Jumping rope: 24 minutes
Swimming (crawl): 25 minutes
Rock climbing: 25 minutes
Cardio kickboxing: 27 minutes
Cycling at a pace of 14 to 15.9 mph: 28 minutes
Running at a pace of 6 mph (10 minutes per mile): 28 minutes
Cross-country skiing: 35 minutes
Snowshoeing: 35 minutes
Burpees: 35 minutes
All calculations are based on a 150-pound woman.
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Source: popsugar.com