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

More Must-Reads from TIME

Contact us at letters@time.com.

Augmented Job Training
Next-Level EV
Flash-Frozen Coffee to Go
Athletic Apparel for the Smartwatch Era
Meditate in the Metaverse
EDIT POST