I think there is some good advice here, and some not great advice, so I'll chime in. I always think you should do the exercises that you enjoy at the gym; and keep doing them. That doesn't mean you DON'T push yourself or move out of your comfort zone a bit with something new... but, there is nothing more demotivating than forcing yourself to do shit you hate. The prize for participating in the miserable Olympics is... being miserable.
The other part of it is, genetics play a big factor. If you are tall, it will take more effort to do exercises and will talk a longer time to gain muscle. Same thing for longer limbs or torso.
Also, you can't spot reduce (fat). If you are losing weight, it will just shrink at random all over. For example, sometimes my arms are the first to deflate, then legs, then tummy last. You can, however, spot IMPROVE your muscles (and give the illusion of a smaller different area of your body) by focusing more on them and eating more protein and fibre and carbs and getting good sleep and keeping your stress down and taking adequate rest days and and and....
If you want true spot reduction, lipo.
I'm saying this as someone who regularly gyms, even with very little (physical) gains to speak of. I do it for the love of the game