j/fit Dead Weight Slam Ball - Classic or Treads Option, Strength & Conditioning Cross Training WODs, Plyometric & Core Training, Squats, Lunges, Wall Exercises (10, 15, 20, 25, 30, 35, 40, 45 & 50lbs) TAKE YOUR WODS TO THE NEXT LEVEL: Cross training is founded on innovation and variety  and our slam ball helps transform your WODS and quickly advance cross training levels, all while letting you reap all of its benefits with unprecedented ease. BOOST YOUR AEROBIC CAPACITY: Slam ball workouts tone the cardiovascular system, enhance circulation and dramatically improve your strength and endurance. By moving at a high speed, you push your body towards producing more power  and FAST. BUILD MUSCLE MASS & ATTAIN PERFECT BALANCE: Slam balls add a layer of resistance to exercises which traditionally rely on bodyweight. They naturally increase muscle mass and improve posture and balance, through aiding in regulating movement patterns. ENGINEERED FOR PRECISION & DURABILITY: Simply the highest quality slam balls on the market. Our slam balls have gone through over 10 re-designs throughout the years, aiming for perfection and both indoor and outdoor exercise precision. CHOOSE YOUR SIZE: Our 9" diameter balls are offered in 10-lb, 15-lb, 20-lb, 25 lb, 30 lb, 35 lb, 40 lb and 50 lb sizes. Get one now according to your strength level and come back to buy more, as your endurance increases!