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It won’t be possible to push Jessica Simpson around much longer, now that the singer (pictured here at LAX on January 10, 2010) is putting in the hours in the ring at the gym. She probably started once she heard this rumor was making the rounds.

The curvaceous singer gushes on Twitter, “Boxing has changed my life! I have so much energy and it has cured my insomnia. Although I don’t think I can get out of bed I’m SO sore.”

Aside from the soreness, there’s another downside to her new fitness routine. On her Twitter, beauty conscious Jess writes more recently, “Dear elderly man at the gym: it’s hard 4 me 2 keep composure whilst punching at chipmunk speed when ur ball sack spills out of ur wind shorts.”

Sorry, I should have warned you guys that this post is NSFL, meaning “not safe for lunch.”