Starting from 6kg in weight, CORTEX sells a selection of 10kg slam balls, 15kg slam balls up to 30kg slam balls. Using heavier weights for your slam ball workout will be better suited to focused strength training and muscle building. Lighter weights are great for incorporated cardio workouts, while also developing functional strength. It’s important to start slow with slam ball, especially if you’re new to them, and get a feel for how your body responds to them. From there, choose a weight that provides an adequate level of resistance and work for your muscles, as well as deciding what area of fitness you want to focus on. Click here for a more comprehensive breakdown on the different types of exercise ball and which will be right for you.