One of the best exercises one can do is cardio. This will have a big word to say when it comes to losing the fatty tissue on top of your pectorals. If you are already going to a gym and you are doing strength exercises, then just stop doing them, as they will only build the muscles up and they will push your man boobs making you look even worse. There aren't any best cardio exercises out there, you just need to try one and see if you can do it or not. 4 times a week and 30 minutes a day is enough.
Push ups are very good to consider after you have already started losing fat and you will see your chest taking shape. This exercise will have your pectoral muscles worked up really well and will tone them very fast. The advantage of push ups is that you can practically do them anywhere you want, even in the bus station.
The Cable crossovers is a nice exercise to consider for toning the inside part of your chest. All you need for this exercise is a pulley station. To perform the exercise you will just need to grab each handle, get in the middle of the pulley holding your arms up by your sides. Then you will need to have your hands slowly brought together in front of you and then cross them and then bring them in the initial position. Lower reps and higher weights are your goal here so do at least 4 sets of 7 reps.
Also you should make sure to be very careful with your sugar intake, as it can really matter a lot when it comes to your man boobs. Sugar is mostly used by people who need energy, as everyone knows it is a valuable source for it.
This means that it will be burned faster by the organism and it will provide the energy you need in order to attend different exercises. What is to be noted here is that you should not eat sugary foods if you will plan on staying on the couch all day doing nothing. You will get to worsen your problem doing so.
If you want to be in for a professional workout, make sure to get some exercise videos. Here you will find the list of all the exercises that you can do and get rid of your man boobs forever. Make sure to buy the best workout videos from a professional bodybuilder, as there are many so called "experts" out there who will be selling you tips that won't yield any results.