Answer: aerobics

AnswerCrossword Clue
AEROBICSSustained exercises
AEROBICSWorkout class
AEROBICSHeartfelt class?
AEROBICSFonda's forte
AEROBICSIt may include a stretch or two
AEROBICSJane Fonda activity
AEROBICSGym class set to music
AEROBICSRichard Simmons' forte
AEROBICSBurning activity?
aerobicsexercise for conditioning the heart and lungs
aerobicsa system of physical conditioning involving exercises (as running, walking, swimming, or calisthenics) strenuously performed so as to cause marked temporary increase in respiration and heart rate