A slam ball is a weighted fitness ball which can be used in a variety of exercises aimed at increasing explosive power and speed. (onnit.com)
Don't get me wrong but I think this us the reason England will not make it past the first round of knockout phases.wilshere just kicked a ball in a single game how does that merit a call up to the squad.and why is drinkwater not even warming with the reserves.this is poor management and I stil believe a guy who has barely played 10 games in the last two years should hbe stayed back hme to build on his fitness (justarsenal.com)
To determine the correct size fitness ball for your core exercise routines (abdominals and lower back), choose a ball where you hips and knees are bent at a 90 degree angle when you sit directly on top of the ball. (build-muscle-and-burn-fat.com)