Article updated: 2/11/2013 7:54 AM

Short, intense workouts gain in popularity

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Short intense workouts are becoming more popular in exercise routines.

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Julie Ennis did not look like she was having fun. As she pushed at the weight machines, it was clear from her grimaces and groans that her muscles were working a lot harder than they felt like working. Standing by with a clipboard and offering encouragement was Brandon Jonker, a personal trainer at Discover Strength in Minneapolis. Aided by Jonker's supportive patter, countdowns and the occasional helpful push, Ennis worked each weight until she appeared to reach the point that fitness authorities typically advise people to aim for: the point at which Ennis would feel that if she summoned all her strength, she couldn't possibly do one more rep.