I have just finished building a fitness centre but now i have completed it, i can not see what benefits thats you get or how it improves my players.

Can anyone help please?

The basic build (before upgrades) gives your players an additional 10% training points, if they are training physicals (speed/strength/stamina).

Each week your players get between 8-12 training points, plus their teamwork skill divided by 2. So the maximum training points they could get (assuming no coaches or other facilities) is 22, they would then get a bonus 2.2 training points so 24.2 max per week. NB it takes 100 points to increase skills by 1.

Hope that helps