What type of body action is described by performing activities such as jumping jacks and cross-country skiing with both feet off the bottom of the pool?

The body action described by performing activities such as jumping jacks and cross-country skiing with both feet off the bottom of the pool relates to bounding. Bounding involves a series of vigorous, high-impact movements that elevate the body off the ground or surface, utilizing explosive power and strength. In the context of the exercises mentioned, the action requires both feet to leave the surface simultaneously, which is characteristic of bounding movements.

Floating refers to being supported by water without the need for effort, while gliding involves moving smoothly through the water without significant elevation. Submerging indicates going beneath the water's surface. These actions differ from bounding as they do not involve the explosive movements that characterize activities like jumping jacks or cross-country skiing, which are active and dynamic, emphasizing the use of strength and agility. Therefore, bounding is the correct term to describe the energetic, airborne nature of the activities in question.