Choosing fitness tracker for weight loss

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I've fallen off the wagon. After loosing nearly 40lbs-with help from MFP- I've gained nearly all back. I've fought through back problems and severe depression, after loosing my dad and two of my dogs within a month last year. I've reached a point where I'm ready to get my stuff back together to start loosing weight again! It's a mental change that I can't wait to take action with... It's the same spark I had before my last journey. I strongly feel a tracker will help me to monitor my exorcise routines, and I'd like a good one that fits my needs. I can't wrap my head around the reviews I'm reading online, so I'm hoping I can get some feedback from people using devices and pairing them with this app.

I don't need something that sends me alerts from my phone. Someone that has some water resistance is essential as I'll be doing some water exercise. I don't need gps as I'll be using my gym. Any feedback is very much appreciated! Thanks a bunch!