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Literally translatable from the English as "plank", the plank exercise is an isometric exercise that is based on the expression of strength and resistance of short duration (resistance to strength).
There are many types and variations of plank; the traditional type is called front plank, of which the classic variant is the forearm plank - with support on toes, forearms and elbows. The starting position is very similar to that of the push-up - push-ups or stretches on the ground - which, however, is dedicated to the development of the pectorals, brachial triceps and anterior delts.
Other types of planks are: side plank, reverse plank, hollow position plank, extended plank etc. The plank, although basically static, can be adapted in some dynamic variants. The plank is mostly done in double-arm (both arms), but some variations involve single-arm (one arm at a time).
Not everyone knows that the plank is an exercise, or rather a position, typical of Pilates and yoga; it is also used a lot in many other types of wellness. It is also widely used in fitness and aesthetic culture (bodybuilding), in the general athletic preparation of various sports (for example in boxing) and in functional or similar disciplines (functional training, boot camp, crossfit, calisthenic, etc.).