Joanna Powell

Joanna Powell is a contributor to Billboard.

Lady Gaga

What's It Like to Be Personal Trainer to Kanye West & Lady Gaga? Harley Pasternak Shares His Secrets

Apparently, working out with the stars can actually be detrimental to your health. While hiking with "close friend" Kanye West in Hawaii, celebrity trainer Harley Pasternak and West were nearly blown to bits in an abandoned military minefield. Then there was the time Pasternak bicycled alongside Alicia Keys across Vancouver Island with a broken ankle and full leg cast. Only slightly less intense are basketball standoffs with Maroon 5 frontman Adam Levine.