Doug McGuff, MD, an ER physician & an expert in exercise, recommends a unique program:
- under 15 minutes a week
- 5 high-intensity exercises
- 90 seconds each
- If you are short on time for exercising, this is the way to go
He wrote a book on this - "Body by Science"
![](https://images-na.ssl-images-amazon.com/images/I/51XCAQEx6UL._SX402_BO1,204,203,200_.jpg)
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