Weight waistcoats, as well as trousers and some cuffs, often come in modular systems. If you are unsure how much weight is really necessary for training or if you need body weights that are as flexible as possible, you should go for modularity. The weights are simply inserted into the waistcoat and can be varied freely up to a maximum weight. This modularity is standard for waistcoats, but rather the exception for joint weights. It is therefore important to anticipate exactly what the cuffs will actually be used for. Dynamic exercises like boxing, for example, tend to need cuffs with an additional thumb loop and lighter weight so as not to compromise speed. Sprints, on the other hand, benefit most from weight waistcoats to increase the bare weight load while maintaining the same range of motion.