Kettlebell The kettlebell is the best friend of many fitness enthusiasts, and for good reason. These bad boys are great for training just about every part of your body! Lifting and swinging kettlebells will strengthen your core and improve your stability. They will also push your arms and legs to work harder during these movements. It’s a genuine all-around muscle-building champion! 2. Exercise or Stability Ball Doing your core exercises with an exercise or stability ball will help increase your core strength and stability, making it one of the most useful equipment for core workouts. 3. The Exercise Mat The exercise mat is key to comfortable core workouts. Remember, many core exercises require you to lie down on the floor or plant your hands and feet on the floor. Using this mat will go a long way in keeping you comfy and your hands clean too! 4. Medicine Ball The heavier weight of a medicine ball forces your core muscles to work harder while you perform your Russian twists and Mountain Climbers exercises. 5. Balance Ball (Bosu Ball) This dome-shaped ball will give an extra challenge to your core muscles and improve your stability. You can use it for many exercises, including V-Sits, Bird Dog stretches, and lunges.