According to several local fitness trainers, a firm chest is one of the most important results men working out want to see happen in their bodies. “It’s why they lift weights in front of the mirror,” said one female fitness consultant. Personal trainer Kenton Swan agrees and he’s been in the business for six years.Speaking with Body & Soul for the Summer Shape-Up series this week he said plyometric push-ups are a good way to tone muscles in the chest. And a big plus is that you don’t need to go to the gym or buy any weights to do them — they’re as easy to do at home as they are at the gym.Exercise: Plyometric push-upMuscles used: Deltoid, triceps and pectoralsTechnique:For beginners1. Kneel down2. Keeping your body in a straight line with your bottom tucked in place your hands on the floor, arms straight3. Slowly lower your body to the floor by bending your elbows4. Raise your body up by straightening the armsRepeat from #3 three sets of five to 10 repetitionsFor intermediates1. Push the hands off the ground in a quick motion that brings the arms under the shoulders, hands on the ground2. Slowly lower your body to the floor again by bending your elbows3. Straighten your arms4. Push hands off the ground again in a quick motion that brings the arms back to their wide starting positionRepeat from #3, three sets of five to 10 repetitions.For the advanced1. Instead on kneeling come onto your toes with your whole body straight.