You can join a gym whatever your level of fitness - the important thing is to set yourself goals that are suitable for you. If you are very unfit, you will need to start off with gentle exercises and build up slowly from there. You may want to hire a personal trainer to create an exercise routine for you.
If you want to focus on strength, then you will probably use weights, either in the form of machines or free weights. People usually lift weights in sets of perhaps 10 or 20, resting between sets. When you use the machines, you will need to adjust them to suit you, for example by raising or lowering the seat, and choosing how much weight you want to lift. If you sweat a lot, don’t forget to wipe down the equipment after you’ve used it. Read the rest of this entry ?