Pink is so hooked on working out when she's touring that her road crew worry that she's too pumped.
The singer admits her band and crew bosses staged an intervention on her last tour - because they thought she was hitting the gym too often.
She tells Allure magazine: "I'm very dedicated to staying in shape when I'm on tour. In fact, last year my crew staged an intervention to try to get me to stop going to the gym so much.
"I just get so into it. I love to sweat and I love to feel like a beast."
And she hates the idea of hitting 150 pounds, like she did over New Year three years ago.
She adds: "I didn't notice until I saw photos… I was like, 'Who is that? Is that me?'
"So I went to Big Bear Lake (California) with a friend for a month to study Muay Thai, which is a martial art that's similar to kick boxing."