Ok, It's sad to say, but I am 30 years old and just truly worked out for the first time in my life a few days ago. I'm naturally small and never had the need to. However, I'm trying to tone myself and just be healthy. So I started kickboxing and yoga. I plan on doing kickboxing 3 days a week. My question is, is it ok to just do stretches on my off days. or will that not give my muscles enough rest? Suggestions please.