When cold, dark, rainy, or icy conditions make it tough to get outside, the obvious option is to hit the treadmill. The good ...

A treadmill with adjustable speed settings. Improves cardiovascular fitness, builds endurance, and helps break through fitness plateaus. Walk at 3 mph for 2 minutes, then increase speed to 5 mph ...

Repeat this 5-minute interval 4 times: Walk for 1 minute (at a similar speed to the last minute of your warmup) at 0% incline ...

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Let's face it: Treadmill workouts can sometimes feel ... Alternate between 2 minutes at a 6% incline (speed: 3.5 mph) and 2 minutes at a 2% incline (speed: 4 mph) for 20 minutes.