Active

Does it have to be Android? - Amazit watches do all of the things. 7-14 day battery, notifications, text, sleep, heart, co2, stress, waterproof, sports tracking, good gps, take voice calls on your watch (if that's your thing). (and typically lots cheaper than Android Wear watches) I've had my Amazfit Active (version 1, the square face version) for a couple of years, battery still last 7-10 days and can't fault it any way.

+1 for amazfit, I also have the active 1 and it's amazing.

I have an Amazfit Active that I use both in the pool and on a lake. It seems to do good with both. Its distance reports a little further than my sister’s Apple Watch, but it was comparatively cheap.

I have a few devices that I like! Amazfit Active Watch and Helio Ring - theyre good all around fitness and sleep trackers. I use them mostly for sleep, steps and light heart rate tracking during the day. My downside to these is, like a lot of lower price smart devices, my watch only checks heart rate once a minute (unless it's set to an exercise mode), and the ring only every 5 minutes. Then (again, unless it's tracking a workout), it'll aggregate the heart rate data over 5 minute intervals for me to look at. It's all very accurate and gives a good quick picture of my day, but I wanted something with a bit more granularity to check our when I don't feel well. Sometimes I also find myself distracted during the day wearing the watch since it'll also send me notifications for texts and such. Visible 2.0 Armband - this is a new addition for me. I've had it a week now. This device only checks heart rate and HRV, but it is constantly monitoring the heart rate and gives you your HRV in the mornings (or during breathing exercise through the app). The data is presented minute-by-minute, it's incredibly accurate and gives a lot of helpful insights into when I'm pushing myself a little too hard. Downside here, it's subscription based. While my Amazfit watch was a one time like $90 payment, this band is an initial cost of $79 with a $20 a month subscription fee. With a referral code (which I used), it basically made it $59 for the band and the $20 initial first month payment. Slightly better but again, it is financially restrictive for some people. If youre interested though, I'd be happy to provide a referral because I do think it's a useful tool at least to gather information.

Amazfit watches have really good battery life and give you the fitness + notifications. I think I have seen that the active series look small on soe wrists