Scale to heavier weights when the repetitions get rid of their challenge by the end of the set.[2] X Exploration supply "There's a cause that dumbbells usually are not created out of foam — it may be weakened in case you drop the weights or knock them into each other." https://how-to-use-barbells-and-d21864.kylieblog.com/27250400/new-step-by-step-map-for-how-to-use-barbells-and-dumbbells