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20 seconds mountain climbers
10 seconds rest
From a full plank position, alternate ‘running’ your knees into your chest as quickly as you can. Push your speed as much as possible so that you are completely out of breath by the end of your 20 seconds.
Get a kick-butt cardio workout with this do-anywhere routine
Blast fat and work up a major sweat in 4 minutes with this at-home Tabata plan.