Start Our 21-Day Flat-Belly Challenge Whenever You Want!

Workouts: Today's ab workout does double-duty in the flat-belly department: not only does it target your core to help define ab muscles, but it also builds muscles all over your body, which helps rev up your metabolism to burn more calories throughout the day.

Recipe: Don't be put off by the "salad" description; this warm, wilted cabbage and quinoa dish makes a light, comforting dinner that soothes tummy issues. Each ingredient helps digestion, and the fiber in the chickpeas, cabbage, and quinoa will help you debloat. If you'd like, add a dollop of Greek yogurt for a creamy element and a dose of belly-helping probiotics.

Get the details for Day 4 here.