Instruct: Classify Amazon reviews into positive or negative sentiment
Query: sturdy but not a very challenging workout

I was hoping for a more challenging workout. This doesn't really do much for the legs, and while you can work up a sweat and raise your heart rate, you can't really go full out. The equipment can't handle it. The footrest straps aren't located effectively, so you really have to pay attention to your feet and even then they still slip out and you have to stop.Recently the piston seemed to lose some oomph, and I've only had the thing for a month or so. It doesn't provide resistance through the full stroke, but only through the latter half of it. I haven't contacted the company yet to see what the deal is with that.My advice; it's cheap, it raises the heartrate, it can be stored upright, it's a decent indoor workout, so it's probably worth buying if those are important attributes. If you want an intense workout, this isn't it. You might be better off with one of the flywheel types of rowers. Some of those are less than $200.