Yes, I think it is better to exercise outdoors
or in a gym with equipment.

->
질문을 헷갈려 하신 것 같은데, outdoors 야외에서 운동하는 것이 좋은지 헬스장에서 하는 것이 좋은지 둘 중 하나를 선택하는 것입니다.

Most of all, I, it I can... get a .. useful informations information, tips, and advice...from professional trainers.

Few days ago... I was... exercise..
every day.. in my home, myself I used to exercise on my own[또는 by myself] at home every day.

but one day, I had got a chance to... exercise outdoors... in a
gym with equipment.

[또는 but one day, I decided to follow my
friend and exercise at the gym.]

I.. I can...
I was able to use various types of equipment and
exercise effectively. Also, I got help from professional trainers and got useful
advice.

Since then, I’ve been exercising
in the gym.

In addition, you can
exercise in the gym regardless of the weather.

These are the reasons why
I prefer to exercise in the gym with equipment.

->
이런 식으로 답변을 전개해 볼 수 있겠습니다.