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A lying dumbbell triceps extension, demonstrated by Mike (Credit: amNewYork Photo/ Lane Johnson)

A lying dumbbell triceps extension, demonstrated by Mike Penzak, a personal trainer at Bally Total Fitness in Sheepshead Bay.

Photos: Workouts through the ages

A lying dumbbell triceps extension, demonstrated by Mike
(Credit: amNewYork Photo/ Lane Johnson)

A lying dumbbell triceps extension, demonstrated by Mike Penzak, a personal trainer at Bally Total Fitness in Sheepshead Bay.

A lying dumbbell triceps extension, demonstrated by Mike
(Credit: amNewYork Photo/ Lane Johnson)

A lying dumbbell triceps extension, demonstrated by Mike Penzak, a personal trainer at Bally Total Fitness in Sheepshead Bay.

A lunge with a lateral raise, demonstrated by
(Credit: amNewYork Photo/ Lane Johnson)

A lunge with a lateral raise, demonstrated by Mike Penzak, a personal trainer at Bally Total Fitness in Sheepshead Bay.

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A simple squat, demonstrated by Mike Penzak, a
(Credit: amNewYork Photo/ Lane Johnson)

A simple squat, demonstrated by Mike Penzak, a personal trainer at Bally Total Fitness in Sheepshead Bay.

A simple squat, demonstrated by Mike Penzak, a
(Credit: amNewYork Photo/ Lane Johnson)

A simple squat, demonstrated by Mike Penzak, a personal trainer at Bally Total Fitness in Sheepshead Bay.