Try this quick interval workout, "then increase by one interval each week," Goelzer said.
- Find a flat area near a hill and walk for eight minutes at a moderate pace.
- Walk uphill for two minutes and downhill for one to two minutes.
- Repeat, completing five rounds in total.
"Once you can get to the top of the hill in those two minutes, race yourself and see if you can beat your time," he added.