A 51-year-old personal trainer shares his 20-minute workout to build an maintain muscle

The celebrity personal trainer Harley Pasternak strength trains for 20 minutes, six days a week. Harley Pasternak Harley Pasternak, a celebrity personal trainer, strength trains for 20 minutes, six days a week. As he ages, he's prioritizing resistance training to maintain his muscle mass. Pasternak focuses on two different body parts and his core in each workout. At 51, Harley Pasternak's focus is building and maintaining his muscle mass sustainably as he ages. Sarcopenia, the natural process…