The Russian twist is a great underrated ab workout for people of all fitness levels or ages and can be scaled harder or easier with a heavier or lighter medicine ball. Even with no weight at all ...

For the workout, I recommend one of the best kettlebells for weight training and a medicine ball; this just needs ... stick to standard Russian kettlebell swings. Try alternating swings between ...

Don’t fancy Russian twists? Try plank windmills instead ... your right arm toward the ceiling and pivot to the right on the balls of your feet until you feel a stretch through the right side ...

This week: Russian twists. Your abs and your core aren’t the same thing. Your abs are actually just your abdominal muscles running down the middle of your trunk, while your core is a whole group ...