London, May 22 (IANS) Singer-actress Jessica Simpson is back in shape after she employed fitness trainer Danny Musico, who created an exercise regime just for her.

‘It’s a 60-minute, interval-based workout. The best part is the punching, it gets a lot of aggression out!’ femalefirst.co.uk quoted Simpson as saying.

Musico, who was a professional boxer, also trains Hollywood actor Leonardo DiCaprio, singer Justin Bieber and Simpson’s dad, Joe Simpson.

‘She’s getting leaner and told me she went down three dress sizes. She’s pushing herself to new levels. She’ll run for three minutes as fast as she can, then rest for 30 seconds, then box for three minutes and so on,’ Musico said.

The 29-year-old actress, who is fronting her own show ‘The Price of Beauty’, faced challenges in meeting Musico four times a week.

‘With her clothing line getting ready for another season of ‘The Price of Beauty’, it’s hard to find the time. But when she’s at the gym, she always gives 100 percent,’ he added.