Loaded Russian twists, performed for 10 reps per side. Hold a weight with both arms for resistance. Twist your torso to the right side until your arms are parallel with the floor.
The kettlebell windmill is a great compound exercise with some much-needed rotation, just like the Russian twist. Clean-and-press the kettlebell overhead while rotating your wrist.
The hanging leg raise is another great ab exercise. Hanging from a chin-up bar, raise your legs until your legs and torso from a 90-degree angle.
The gorilla chin/crunch is kind of similar to the hanging leg raise but still a bit different--that's why it's another stand-alone exercise. Here, hang from a chin-up bar with an underhand grip.
Next up is the barbell ab rollout, which will work your core. Place a barbell, loaded with 5-or-10-pound plates, on the floor in front of you so that you are on your hands and knees
The cable crunch is another classic ab move. Kneel below a high pulley that contains a rope attachment. Grasp cable rope attachment and lower the rope until your hands are placed next to your face.
Lying on your right side and keeping your left leg over your right one, place your right hand in a comfortable spot and clasp your left hand behind your head.
The plank helps develop overall core strength and stability. Hold yourself up using both elbows in the prone position and hold the position for as long as you possibly can.