Пожалуйста, проверьте текст на ошибки. I didn`t go to sea and I didn`t visit different cities or countries on my summer holidays. I stayed at home. But I can`t said that my summer was wrong. My summer affairs included doing some exercises in English, solving maths problems and reading many books. But there is a thing, that I proud of the most. My brother invited me to visit the gym at the beginning of June, and I agreed. So, during 3 summer months, every Tuesday, Thursday and Saturday, I sported. We did power exercises, ran on the threadmills and use other trainers.
I`m going to continue visiting the gym, and I think. I spent my summer holidays usefully.