Question

which is a strength - training activity? sit - ups tennis hopscotch jump roping

Explanation:

Strength - training activities are those that aim to build muscle strength. Sit - ups primarily target the abdominal muscles and involve resistance against one's own body weight to build strength. Tennis is a sport that involves more cardiovascular and skill - based aspects along with some strength, but not primarily a strength - training activity. Hopscotch is a playground game that is more about coordination and light physical activity. Jump roping is mainly a cardiovascular (aerobic) exercise that improves endurance and coordination rather than being a primary strength - training activity.

Answer:

A. sit - ups