Russian Twist

  1. Start by sitting on the floor, with your knees bent and feet flat on the ground.
  2. Grab a light kettlebell or medicine ball in your hands.
  3. Then lean back so your upper body is at a 45-degree angle to the floor. Keep your back straight at this angle throughout the exercise, as it will be tempting to hunch your shoulders forward.
  4. Tense your core and raise your legs off the ground.
  5. Rotate your arms all the way over to one side, then do the same in the other direction. This is one rep.
  6. Repeat for 20 reps or for a minute.