Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Great workout!

I enjoy this workout very much. Being a firefighter I need a physically challenging workout. Running and weight training for years started to wear out my knees and compress my spine. This really allows me to push myself to my edge every day without the knee beat down or back problems. I gave it four stars instead of five because it has a few too many pushups which if done this way, will burn out the arms and won't let me do it every single day. Some days I skip the pushups all together.