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Weight train­ing is a com­mon type of strength train­ing for devel­op­ing the strength and size of skele­tal mus­cles. It uses the weight force of grav­i­ty (in the form of weight­ed bars, dumb­bells or weight stacks) to oppose the force gen­er­at­ed by mus­cle through con­cen­tric or eccen­tric con­trac­tion. Weight train­ing uses a vari­ety of spe­cial­ized equip­ment to tar­get spe­cif­ic mus­cle groups and types of move­ment. Sports where strength train­ing is cen­tral are body­build­ing, weightlift­ing, pow­er­lift­ing, and strong­man, High­land games, shot­put, dis­cus throw, and javelin throw. Many oth­er sports use strength train­ing as part of their train­ing reg­i­men, notably; mixed mar­tial arts, Amer­i­can foot­ball, wrestling, rug­by foot­ball, track and field, row­ing, lacrosse, bas­ket­ball, base­ball and hock­ey. Strength train­ing for oth­er sports and phys­i­cal activ­i­ties is becom­ing increas­ing­ly popular.