Best, cheap fitness tracker??? Help!

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I have an Apple Watch series 3. It is on the fritz with a snowy static screen. I want to buy a new Apple Watch when they release the latest one this fall (Apple 6).

In the meantime, I need a good fitness tracker to track steps, heart rate and Calories burned...preferably be able o track other exercises like weightlifting or elliptical, but not necessary as long as It is fairly accurate at calories burned.

Any suggestion? I just need something to use until I buy an Apple Watch in the fall. Thanks for your help!