The machine shouldn't shudder or hesitate. Walkers need machines that go up to 5 mph. Runners will need a top speed of 8-10 mph. Inclines of up to 15 percent add variety and intensity. Make sure incline can be changed while you're exercising and doesn't mean climbing down to move a pin on a support leg.
Treadmills can be the great motivator when it's too cold, too hot, or too dark to venture outside.
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