Boxing Shoes
Sports Dictionary
Bruce Lee: "Among other things, don't try to cheat yourself in any exercise: work only with the weight you will handle without undue strain."
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special footwear used in boxing. An essential element of the construction of modern boxing shoes is a relatively rigid fixation the ankle joint to prevent the possibility of dislocation foot. In addition, the following technical features are obligatory - the soles of boxing shoes, which provide a relatively firm grip on the flooring, also boxing shoes must have a relatively firm grip on the ring surface, while maintaining some ability to slide. 
Bruce Lee: "Among other things, don't try to cheat yourself in any exercise: work only with the weight you will handle without undue strain."