Megan Crouse stood on a black yoga mat spread across the floor of her family room in Monrovia and pushed two 5-pound dumbbells above her head into an overhead press.
Personal trainer Donavan Cox chided Crouse a bit from the flat-screen television on the wall in front of her. Cox, who was directing Crouse from his home studio in Columbia about 35 miles away, noticed that the exercise seemed a little too easy for his client.
“Those weights are too light,” he said, telling her she needed to use heavier ones for the next set.
Cox is training more of his clients this way — via live, two-way video streaming. The concept is a growing one in the fitness world,...