Sports

I’m not really interested in sports because I am not an active person; I usually prefer doing other things like reading books or going out with my friends. However, last summer I discovered an interesting sport, it is scuba diving. I really enjoyed this experience so I want to do this sport more often. In addition, I would like to try skydiving, because I think it is an amazing sport. I would like to feel the adrenaline while I fall through the sky. Another interesting sport which I want to try is kayaking. Next summer I could do it.
In my opinion, the most famous sport in my country is football; most people like this sport, especially men. Most children start playing football since when they are a few years old. Basketball is another sport which people do, but it isn’t as important as football, I think.
Some years ago, I went to gym three times a week but it was really boring. Currently, I don’t go to the gym and I don’t practice any sport. I really think I should do more sport because do it is healthy; nevertheless, I sometimes walk a few kilometres in the countryside with my dog.
I enjoy doing relaxing things like reading books, watching Tv series or films, talking with my friends or drawing. I like being physically relaxed. However, I believe I should do exercise more often because it is good for your health as well as for your figure.

Be careful about run-on sentences. These are two sentences that are combined into one without a conjunction (and, is, or,...). Sometimes you just put a comma in between them, which is not sufficient. But otherwise, this piece was well written and the grammar mistakes that I corrected are minor.

Sports

I’m not really interested in sports because I am not an active person; I usually prefer doing other things like reading books or going out with my friends. However, last summer I discovered an interesting sport: scuba diving. I really enjoy these experiences so I really want to do this sport more often. In addition, I would like to try skydiving (¡Yo también!), because I think it is an amazing sport. I would like to feel the adrenaline flowing (or pumping) while I fall through the sky. Another interesting sport which I want to try is kayaking, next summer I could do it.
In my opinion, the most famous sport in my country is football (¿fútbol o fútbol americano? Porque en inglés usamos "Soccer" para significar "fútbol" y "football" para significar "fútbol americano"); most people like this sport, especially men. Most children play football since they are just a few years-old. Basketball is another sport which people do, but it isn’t as important as football, I think.
Some years ago, I went to gym three times on week but it was really boring. Currently, I don’t go to gym as well as I don’t practice any sport. I really think I should play more sports because doing so it is healthy; nevertheless, I sometimes walk a few kilometres in the countryside with my dog.
I enjoy doing relaxing things like reading books, watching TV series or films, talking with my friends or drawing (en esta frase, necesita usar "ing" al fin de los verbos pero cuando quiere decir "Me gusta (o me encanta) leer libros, mirar TV o peliculas, hablar con mis amigos, y dibujar" puede decir "I like to read books, watch TV series or films, talk with my friends, and draw" y también "I like reading books, watching TV series or films, talking with my friends, and drawing"). I like being relaxed physically, however, I do (por énfasis) believe I should do (en ingles no necesitamos usar el verbo "to do" porque "to exercise" ya es verbo. En espanol se lo usa, pero no en ingles) exercise more often because it is good for your health as well as for your figure.

¡Su inglés es fantástico! ¡Buen trabajo! La sola cosa que yo vi fue cuando usaba el verbo sin el "ing" al fin de ello. Solamente hay mucho azul porque yo queria explicar las cosas que yo vi que fueron incorrectos y intentar a explicar por qué y como pueda mejorarlas. Pero muy, muy, muy bien! Va a poder a hablar en inglés con fluidez muy pronto!