I am relatively new to swimming and just want to do it for a bit of fitness to complement my running. When I do 30 mins of breast stroke I don't feel like I get much of a workout. It is a bit boring to be honest. When I do crawl (I think it is called freestyle) I get a great workout.
Is it okay just to swim once a week and do the same stroke? Would I be missing out on working a certain set of muscle groups if I don't alternate my type of stroke?