8. Tech40’s Accelerator Pro ($99.99 to $129.99; http://store.tech4o.com)
Why we like it: The Accelerator Pro does everything a sports watch should—from monitoring your heart rate and counting laps to recording how many calories you’ve burned and alerting you when you’re out of your target heart rate zone. Its Pro Plus model even allows you to upload your data to your computer to measure your progress. But we love its built-in accelerometer sensor, which actually detects changes in how fast you’ve moving by measuring electric current, then lets you know how fast you’re moving and traveling as you break a sweat. It’s also one of the most user-friendly watches out there, which can make your workout a little bit less stressful by eliminating some of the fiddling frustration that many sports watches can cause.