Fitbit's Charge 6 Fitness Tracker Is Now Under $125, and It 'Packs a Punch'

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Why We Love This Deal

Experts say it can take up to three months of training to start seeing substantial muscle gain, but with the right fitness tracker, you can start to see hidden data and metrics way sooner than that. Unfortunately, top models can be rather expensive; some of the newest Garmin smartwatches cost $1,000 or more, for example. Luckily...