If you find it impossible to devote 30 minutes for an aerobic workout session in the morning, try the 3x10 approach.A Stanford University research says that three 10 minute workout sessions (morning, lunch and evening) produced the same benefit as a solid 30 minute workout at one time.
Brad Isaac therefore suggests a a ten minute jog in the morning, a 10 minute walk at lunch, and another 10 minute jog at night.
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Source: No time for the gym? Work out in installments