Can cold showers benefit or harm our practice (our concentration)?

I actually have two different questions : 1. Can cold showers benefit our practice? 2. Someone once told me not to take showers when doing a lot of meditation because the cold reduces the concentration level: is this true? The person who told me this talked about "regular showers" not "cold showers"; now that I got interested in cold showers after reading about their health benefits, it made me worried that they would harm my concentration level. For the record the person who told me this was a theravada monk