Fresh off his 21st birthday, Justin Bieber strips off his shirt and shows off his physique for the April “Reinvention” issue of Men’s Health.

In the cover story, the pop star reveals that he’s lifting weights five times a week. Biebs also says he can solve a Rubik’s Cube “in less than a minute,” loves legs on a woman (“I really like jean shorts and like a tank top. Or spandex”), and relates to Michael Jackson.

Justin Bieber’s cover will be available digitally on March 10 and on newsstands nationwide by March 17.