i like to do mon/wed/fri/sat. back bis/legs/chest tris shoulders/oly lifts. that's me, that's the split i use for my specific goals. you say you want to bring your chest up so you hit it twice a week sometimes, you grow outside the gym man, as cliche as it may sound. let's say you hit the gym 4 days a week an hour at a time. that's 4 hours. there are 168 hours in a week. diet and rest are the most important factors here, you go to the gym to break the muscle down, the other 95% of the time is spent repairing it thus making it bigger and stronger. if your chest is lacking either in size or strength you don't need to add a day, you need to look at what you are doing that one day and revamp it. you want size? i suggest squeezing exercises such as flies, preferrably cable flies. you want a big bench? then bench big. what are your goals btw? strength? size? you trying to compete at a powerlifting meet one day? strong man? you just want to be functional? you just trying to get big and cut for next beach season? hope to get your pro card one day? this will determine what your training schedule needs to look like. i can't help you tooo much with the info you've given us. more detail. like your exact training, what each day in the gym looks like, your exact diet, and how much sleep you get. as well as cardio, what are you doing. also list your 1rm for back squat, front squat, bench, OHP, deadlift, bent over rows and weighted pullups.