When it comes to exercising, there's usually one classic excuse:
"I don't have the time."
Well what if we told you that a man, Dr. Michael Mosley, believes that only three 20-second bursts of high-intensity training is all you need to be skinnier and healthier!
Doc Mosley came out with a book called Fast Exercise which is all about working in working out into even the busiest of lives.
The doc talked about how the best workouts are all about