So a few weeks ago I started on the Hundred Pushup Challenge and a couple related programs, and they were working out for me, especially since at first I had definite, noticeable strength gains (could do more reps each day than I was physically capable of the previous day). Towards the end of that program, though, the gains started to plateau, so instead I started transferring it over to just using some of the equipment in my (then) apartment complex, trying to do more weight with fewer reps, to get it done faster, going for strength over endurance. A point of note is that I've heard that simply HAVING muscle helps burn fat, so I was aiming more for muscle mass than for straight-up cardio or anything.
Unfortunately, life threw a curveball or two, and now I'm housing with a friend of mine, so I don't have an exercise room within easy walking distance for minor workouts. We got a joint membership at a rec center, but he prefers longer workouts than I'm used to (I would do like 15-20 min on one of the challenges, get bored/tired, play video games for a bit, then do another challenge). Now, the rec center has a lot of equipment, but I don't know of a good starting target to aim for on most of the machines, or good weight numbers to start on, etc., etc.. Today was my first day there, and I used roughly 100 lbs as an initial benchmark, tried out a number of machines for upper body strength (I have knees like Boba Fett's, so I tend to avoid leg workouts), and on most of them I was able to do somewhere between 13 and 20 reps, depending on on the machine, how tired out I was from previous ones, etc.. To give an idea, I'm about 5 ft 7, and weight fluctuates between 155 and 160. Anyone have a general guide to goals I should aim for? I know I tend to do better with definite, measurable targets to try to reach, rather than just trying to see how many reps I can do on a machine each day....
Side note: I'm actually surprised there isn't any kind of sticky on this kind of subject.

