I'm interested in your lab because I'd like more experience in research. To me, one of the most interesting things about research is the fact that you're able to appreciate all of the intricacies of a topic that at first seems simple. I think muscles are a perfect example of this. Everyone uses them every day, but most people never even stop to think about all of the inner workings of muscles. There's still so much that we can learn about the way muscles work, and knowing more about muscles can only help in finding a cure for diseases that affect muscles, such as muscular dystrophy.
By working in your lab, I hope to improve my abilities as a scientist. I also hope to make a meaningful contribution to the study of muscles because it's a cause that I think is important.
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So there you have it. I'd say it's at least 25% BS, but whatever. We all know the real reason why people join research labs is to get into med school. Why else would anyone work for free?
Honestly, the whole research thing is such a scam. IMO students shouldn't be allowed to work for free.