Jessica Simpson has dropped three dress sizes in recent months, according to her personal trainer.
The singer-and-actress employed fitness trainer Danny Musico to make an exercise regime just for her, which combines boxing, cardio and weights.
The Breaking News website quotes the trainer as saying: "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."
Simpson told In Touch Weekly that she is enjoying her new trainging programme: "It's a 60-minute, interval-based workout. The best part is the punching - it gets a lot of aggression out!"
Musico, who is a former professional boxer, also trains Leonardo DiCaprio and Justin Bieber.
