which is a strength - training activity?\no sit - ups\no tennis\no hopscotch\no jump roping

which is a strength - training activity?\no sit - ups\no tennis\no hopscotch\no jump roping
Answer
Brief Explanations:
Strength - training activities build muscle strength. Sit - ups target abdominal muscles. Tennis is a racket sport focusing on hand - eye coordination and endurance. Hopscotch is a children's game mainly for balance and coordination. Jump roping is a cardiovascular exercise.
Answer:
sit - ups