Membership at a sSports cClub

All content words in a title should be capitalized.

I've joined a sports club not far from my place and the undergroundmetro station.

Your original sentence with "underground" sounded a bit unusual to me, so I changed it to "metro". It isn't technically wrong, however.

I badly need to get in shape, but I have been lackeding motivation to exercise.

Now I have access to experienced and certified trainers, and whenever I'm in a slump my new club mates will shout out words of encouragement .

I have signed up for body-sculpting classes and ballroom dancing lessons, and I'm going to attend them twice a week.

My first aerobics class consisted in of exercises for toning the buttocks and inner thighs.

The instructor turned out to be my neighbor from across- the- hall neighbour, Adam.

However I decided not to give up especially whenbecause Adam informed me that my membership included unlimited access to the sea water jaccuzi, steam saunas, and beauty parlours.