Chests. Along with the abdominals, usually the most 'go-to' feature of the male physique when it comes to workout goals. It shouldn't be, of course - you should be looking for all-round improvement, not least in back and legs. But anyway.... ...it's chests to fuel your training ambitions today! We would say that the three key exercises to build the chest are flies (cable or dumbbells), bench press inclined to about 30 degrees, and double cable pulls from above and below to develop the whole muscle. A couple of relevant videos lower down.  

Aesthetics and all that. Isn't this what every guy wants? Just put in the effort, and you could join the gallery!