Only takes 4 minutes, but its the longest 4 mins of my life: Burns as many calories as a 40-60 minute run. Makes your body adapt and improve very quickly. Increases metabolism for up to the next 36 hrs. Takes only FOUR minutes, Developed by a Japanese Scientist. NO EXCUSES. 4 minute workout? May have to try it soon.
Thigh Thinner- Stand with feet hip-width apart, toes out, holding 10-15 pound kettlebell at chest. Lift left heel off floor, then squat(as shown). Return to start. Switch sides; repeat. Continue, alternating sides, for 1 minute.
Cross-Body Mountain Climber --Get into a pushup position with your arms straight (a). Bring your right knee toward your left elbow (b), return to start, and then bring your left knee to your right elbow. Continue alternating legs at a fast pace.