The best way to have a "flat chest" is do about 30-40 sit ups a day, and do ab crunches 20-30 every day.
bench press
pushups
How does exercise affect your breathing? Not getting enough exercise to help exercise your lungs could cause you to have a flat chest and rounded shoulders.
Bench press
To build upper body strength the best chest exercise is lifting weights.Dumbells are the easiest way.Start on smaller weights and build up to heavy weights.
To do a chest press, select a weight that will allow you to do ten to fifteen repetitions of this exercise. Grab a dumbell in each hand. Lay flat on a weight bench with your feet touching the floor. Raise the dumbells straight into the air until your arms are fully extended. Bring the weights back down to your chest and repeat.
The best exercise for chest muscles is a combination of bench press and chin pushes. The key is not to over stress and push too hard, it is important not to do damage however strain is needed.
You need to focus on exercises like bench pressing and fly lifting. Also, if weight machines are not handy, you should be aware that pushups are a good chest exercise if no machines are available.
Flys work the pectoral muscles of the chest. Usually they are done on a flat bench or an incline bench.
Chest fly exericese is performed with dumbells. On youtube you can find some of the best videos where they show how to do it. The best way is to watch the video so you will understand how to do it or otherwise you can get an injury.
It's all normal to have man boobs at any age. The way to get rid of those are to lift weights and exercise and after a while you shall be all cleared and flat on the chest.
Unless you are very unusual genetically, your chest will not grow without overall growth. Since the best exercises for overall growth are squats, deadlifts, and their variations, ensure that you are using at least one of those exercises at every workout.The best and safest exercises for chest are presses. At different training sessions, you should use both an incline and a flat bench and use both barbells and dumbbells. Also vary your reps. do not train your chest more than twice weekly.Notice which exercises promote DOMS (delayed onset muscular soreness) in your chest, and concentrate on using those exercises. Different trainees react differently to the same exercise.Learn perfect exercise technique. When doing flat or incline presses for your chest, it is best to minimize the involvement of the front deltoids. To get the most chest development, concentrate on squeezing your pectorals as you press. Do not be surprised if it takes you many months (or even years) before you master presses for your chest.