Danny Weiss
These are independent reviews of the products mentioned, but TIME receives a commission when purchases are made through affiliate links at no additional cost to the purchaser.

SPECIAL MENTION: Ensuring adequate hydration when working out can be tricky. The Nix Hydration Biosensor attaches to your arm with single-use kinesiology tape to measure sweat, and sends notifications to a smart device when you need to hydrate, including recommendations for how much to drink. It is available for preorder.

Preorder Now: Nix Hydration Biosensor

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