Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Impressively, this heart-rate monitor can last about a year, as long as you only use it an hour per day.
Source: https://www.cnet.com/health/fitness/best-chest-strap-heart-rate-monitors/
You can buy an Apple-watch-esque heart-rate monitoring device or rent one from Orangetheory.