You may want to also check out:
This is the SPRI Dead Weight Slam Ball: a heavy duty ball for tossing, slamming, endurance, and core strength training. You can order this in 15lb to 30lbs. It has a textured non-slip surface. You can use this sand-filled ball to build endurance and add more resistance to your workouts.
*some of our articles have aff links. Please read our disclaimer on how we fund Exxponent.