“When choosing the correct weight for your kettlebell, it is important to consider your exercise,” says Almoni Ellis, CSCS, CPT. Ellis and Pack recommend choosing a cast iron or steel kettlebell because they’re the most durable and long-lasting materials. To choose the best kettlebells, I consulted three personal trainers who regularly work with kettlebells: Taylor Beebe, CPT, Tyneka Pack, CPT, and Almoni Ellis, CSCS.