For The Truth About Love singer, parting with 55 lbs. of baby weight wasn't a race, but a slow and steady marathon. "It was hard work, and I'm still getting there," she told PEOPLE in September, 15 months after daughter Willow's birth. "I love to feel fit. I love to feel healthy … I'm an athlete so I have to be strong," Pink said of her 90-minute workout program and 1,200 to 1,400 calorie diet.