Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good workout tool when injured

I purchased this when I got injured while training for a marathon. I am a petite female and it fits well, but I found the belt will cause me to chafe on my lower back when aqua jogging for more than an hour (I wear a bikini and wear this in the ocean). The strap is adjustable, so perhaps I need to make it more snug, otherwise I'll wear a rash guard to prevent future chafing. The material is of good quality and it has held up well with salt water. I tried aqua jogging without the belt and it's a lot harder and I tend to sink. I live in Hawaii, so I just hop in the ocean and aqua jog about 500 meters and back, so it's not as boring as if I were in a pool. I rinse it off afterwards and keep it in my car. I'm happy with my purchase and even though I'm starting to run again, I see the benefits of aqua jogging (especially when it's too hot to run).