Series;1)Bend and extend legs with oposition.2)Try to reach the floor with extended leg, with oposition.3)Advance with a companion carried on back.4)Jump over an crouched companion.5)Simultaneusly bend and extend legs with oposition, back on the floor.6)Resistance to run, grabbed by hip.Two complete runs of the playground:1ª)30” of action 30” recovering.2ª)20” of action 40” recovering.