I began teaching group exercise classes about 20 years ago. Today, I am the founder of barre3, which is based on classes that combine the disciplines of ballet barre work, Pilates, and yoga. This sequence includes four of my favorite core exercises because they're efficient, results-driven, and energizing. You can do all of these moves consecutively for a quick, targeted 8- to 10-minute core workout. If you're crunched for time, choose a couple of moves to light up your core, rev your metabolism, and refresh your energy!
Props You'll Need: Yoga mat, core ball, sturdy waist-high surface, optional light weights