Which muscles are used primarily in kendo, and can they be trained through isolation exercises in a gym?

I noticed a trend of muscle pain in my shoulders, upper pectorials, and calves after my first 6 sessions at my dojo. That got me wondering what are all the muscles that are used in kendo and which rely on endurance over strength, and vice versa.

I have a membership at a gym and I lift weights 2-3 times a week in addition to doing kendo twice a week, so I was also wondering if there is anything I could do in the gym that would help with my performance in kendo.

I understand that a lot of the fundamentals of kendo come from the brain, but your body does still have to keep up with the brain after all.

Thanks!

Answer: Thanks for your post. It is always a good idea to train your muscles or stamina for kendo. However, I am not an expert in those area, so I would like to wait for some answers from experts.

Now there is a Q&A about kendo and stamina if you are interested.