Tighten your abs, pulling your belly button in toward your spine and making sure to engage your core throughout the exercise ... also be at a 90-degree angle. After holding the lunge for a ...

Cole Barash for The New York Times Popular core-strengthening exercises, such as crunches or situps, primarily work the larger, exterior muscles while neglecting the deeper muscles. Two to three ...

While staying standing means that you won’t do a lot of classic core exercises like the plank ... between moves while Shirk explains what exercise is coming up, but in rounds two and three ...

Thankfully, there are a few ways you can get a good abs pump and continue to develop core muscle ... performing each exercise for 30 seconds each, taking a 30 second rest after round one and ...