Train today... and tomorrow... actually 4-5 days a week would be good...  

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.