I'd like to build myself up to a century, but the fact is with my schedule I can only ride any length on Saturday and Sunday and occasional Fridays. The other days of the week I go to the gym and spend an hour there either on the elliptical, treadmill and/or lifting weights. I go to Planet Fitness so there isn't a pool or any classes, which is too bad. I'd like to try a spin class.

Are there things at the gym I can do that would help my goal or would it be better to invest in a trainer and live with the boredom of that during the week

So far my furthest distance is 40 miles at an average of 13.8 mph and I felt pretty good on that ride. We did have about 20 minutes worth of stops in there where we regrouped and one bathroom/food break.