Using only your body weight can be an extremely effective strategy for strengthening your core muscles. The movement-based exercises should be performed at a steady pace under control in order to keep the muscles under tension; the isometric exercises should be held for the designated period of time to keep the muscles under tension. The great thing about bodyweight workouts is that they can be done anywhere, which makes them an excellent option if you travel a lot for work or your time is extremely limited and you need exercise solutions that fit a tight schedule.
Try these kettlebell exercises for core strength from Smarter Workouts.