Wnat a good question. We all have to deal with this. My dear uncle taught me a good technique. When you do your reps count backwards. Also imagine how good you will look as you become more fit. Semd us a picture so we can see.
It would be helpful if I knew what level of training you are. But for all concerned a little resistance training can do wonders to stimulate growth. You only need a few minutes of exercise per day. Try doing 20 push ups or press ups and 20 sit ups or stomach crunches very very slowly. You will be surprised how much more difficult exercises are if they are done slowly. The good thing is that you will build muscle very face like this.