Please choose the correct ending to complete the given sentence: Doing karate: Two boys perform karate on front people stand in a circle. then

Ending1: , the boys put extreme tension, then they belt each other. Ending2: , a girl stand facing the camera, move slowly the legs. Ending3: , a woman and a man join the boys to perform karate in an alternate way. Ending4: , the boys stand on the palms bending bent for balance.

Answer format: ending1/ending2/ending3/ending4