Only takes 4 minutes, but its the longest 4 mins of my life: Burns as many calories as a 40-60 minutes 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.
We have some great news for your abs: The ultimate piece of belly-fat-busting equipment is a $30 stability ball. When researchers at California State University, Sacramento, hooked up electrodes to the midsections of 18 people, they found that ball moves recruited twice the number of muscle fibers as traditional crunches or yoga/Pilates-inspired workouts. Scientists credit the ball's instability with doubling the toning power of these moves.