a man doing a variation of a push up with another man guiding him
A man is doing mountain climbing exercise in a gym.
A fitness trainer talks about an athletic position as a man demonstrates it on the floor.
A man demonstrates a stretch and the instructor explains the technique.
A man is explaining how to do an exercise while a young man is demonstrating in front of him.
Two men demonstrate how to do knee lifts from a plank position
A man is talking while another man demonstrates an exercise.
A trainer is showing on another guy the proper position to do a push up.
a man in black guides the stretching of a man next to him
A man shows another man how to do an exercise such a planks or pushups.