Many people only think about take exercise when they are overweight.
about taking
It may be good to use a bicycle instead of going by public transport.
Correct
Students are not allowed running along school corridors.
allowed to run
Few people choose spending their time doing exercise.
choose to spend
What's the activity?
parachuting / skydiving
What's the activity?
climbing / rock climbing
Unless they try to compete as a team, they will not succeed to win the competition.
succeed in winning
What's the activity?
mountain biking
What's the activity?
Hiking / trekking
The internet means that we spend more time sitting at home, but we cannot imagine to live without it
imagine living
What's the activity?
camping
Doing a sport is a good alternative if you are bored to sit and read a book.
bored sitting and reading
There are several good reasons for ride a horse.
for riding
Being fit and healthy does not mean to run 20 km a day.
mean running
Many students would prefer to cycle to school than go by school bus.
Correct