We put this on the list because of how easy it is to manipulate the degree of difficulty. If a regular plank is too easy for you, lift an arm, or a leg—or an arm and a leg. Put your feet into a TRX and give that a whirl. Still too easy? Take your feet out, and put your forearms in. Each one of these progressions leads to a greater training stimulus to the abs.
Eat similar meals every day. "I pretty much eat the same thing, or substitutions that are very close to my normal meal plan, every day," Yobe says of her daily food intake, which includes a protein bar before her morning workout, a protein shake afterward, and two meals including chicken or fish, veggies like a green salad or bok choy, and a carb like rice, pasta, or potatoes. She also snacks on rice cakes with peanut butter, carrots, celery, and nuts. Although she admits this can be boring, the approach makes it easier for her to get all the nutrients she needs while remaining satisfied throughout the day.
Demoing the moves below are Crystal Williams, a group fitness instructor and trainer who teaches at residential and commercial gyms across New York City; Amanda Wheeler, a certified strength and conditioning specialist and co-founder of Formation Strength, an online women’s training group that serves the LGBTQ community and allies; Cookie Janee, a background investigator and security forces specialist in the Air Force Reserve; and Rachel Denis, a powerlifter who competes with USA Powerlifting and holds multiple New York state powerlifting records.
Do it: With your feet shoulder-width apart, lift a barbell off the rig, centering it evenly across your shoulders. (This version of the squat targets the core, not the legs, and so you should be using far less weight than you would for a traditional back squat.) Send your glutes back like you’re lowering into a chair, bending at the knees as deeply as possible. Press through your heels to return to the starting position for one rep. Do 12 reps for one set.
There are thousands of trainers and infomercials hawking quick, effortless programs that are guaranteed to give users abs in mere minutes a day — as long as they buy an expensive piece of equipment or DVD set, of course. For some people with impeccable genetics or bulletproof diets, that might just be enough to make their core ripple with muscle. But most bodies just aren’t built that way.
To do it: Stand with your feet planted 3-4 feet apart, toes slightly turned out, hands on your hips. Lower into a plie by bending your knees out over your toes and lowering your hips directly underneath your shoulders. Then, as your straighten back up, slowly lift the right knee up towards the right shoulder. As you go back into the plie, slowly return the foot to the floor. Be sure to move at a very controlled pace to really engage the obliques the entire time—on the way up and on the way down. Do 10 repetitions on the right side, then another 10 repetitions on the left side for a total of 20.