Here's what's On The Rise in Fitness over the last 30 days, according to Trendrank:

• Studies show that drinking diet sodas makes you eat more
• Victoria's Secret models challenge Zac Efron to a full-body workout
• Burnout is now an officially diagnosable condition
• Kanye West opens up about bipolar disorder in David Letterman interview
• Eco-friendly fitness craze 'plogging' combines jogging with an effort to clean up environment