This is a test of commonsense. Complete the next sentence:

How to flatten your belly incorporating small everyday changes
Talk and walk.
Instead of catching up with friends over food and drinks, suggest a reunion on the move-you're likely to work out if you have an exercise buddy. Suggest a weekly walk-and-talk session, form a friendly fitness club, or try a new class at the gym together.
Sculpt your core while you walk. As you go about your day, imagine there's a magnet pulling your belly button back toward your spine.