How many times you incorporate kettlebells into your training really depends upon the intensity and frequency generally of your workouts and what other physical activity you are doing your kettlebell programme in conjunction with. A good aim is to go for 3 sessions or up to 5 if you really want to see quick and dramatic results. As always though when undertaking a new regime, check first with a physician or a professional and start out slowly, building up your session as you build your confidence, technique, and your strength.