...to show {} ways of improving... - you don't need to use the definite article here because you're not writing about particular ways of improving the facilities yet, you're writing in general
...some counters {on} the bicycles are... agreed with terri about this
...to check the results of exercises. - I can't agree with terri about this one - as you wrote, martunia, you don't need to use 'the' in front of 'exercises' - it's a similar situation as above - you're not writing about specific exercises; yet, you should use 'the' in front of 'results' (just as you did) - this time the use of 'the' is similar to the following:
- the cover of a book
- the keys to a car
- the handle on a door (they are always specific)
As {a} result,...
...them are considering {withdrawing} from...
...There is {simply} not... - agreed with terri
...{The} tables are... - we know exactly which tables we are writing about - the ones in the club
...another what disturbs during game as people collide together. - write just like terri did
60% of {the club} members suggested... - the members of the club that you're writing about
...and the rest {} had no opinion (of that)... - I suppose 'the rest' means 15% of all of the club members; you could leave out the phrase 'of that' - it's correct, but it's already obvious what the statistics are about
...had no opinion because they {did} not {play} tennis. - I'd rather apply the sequence of tenses here - maybe they do play tennis now, who knows
...|what members hope to be changed| {is} the quality of the equipment in the gym and making more... - well, the subject here is in the singular, so I think you should have written 'is' instead of 'are' - agreement between subject and verb