Los Angeles - Chris Martin has hired a £110-an-hour personal trainer.
The Coldplay singer has taken up boxing in a bid to get fighting fit ahead of the band's next tour, and his workout regime will be handled by an expert recommended by superstar rapper Jay Z.
A source told the Sunday Mirror: "Chris is a big fan of boxing and loves nothing better than working out with a punch bag.
"He doesn't want ridiculous biceps but he wants to build some definition in his skinny arms and improve his stamina."
The pop star recently split from Gwyneth Paltrow after 10 years of marriage, and it is said she has angered friends by "bragging" about their amicable divorce.
An insider recently said: "All she's doing is bragging about how peaceful her divorce is and how she and Chris planned it so perfectly that it is hardly disrupting their lives.
"Gwyneth has always thought she had the most perfect life and even though she's getting a divorce and both of them are getting bad press she doesn't care.
"She has become insufferable saying how happy she is with the way everything is evolving. It's so ridiculous to listen to her talk as if nothing bad is going on at all for her. But Gwyneth has always had a protected privileged life and this is no different."