Back Exercise Isometrics focuses on working three major muscles: The Lower Back (the erector spinae – the two cords of muscle on the back responsible for good posture and the ones that cause the most low back pain) The Upper and Middle Back.
You can use Isometrics when weight lifting, through the contraction of particular muscles during a lift.The same applies to bodyweight exercises. Breathing during isometrics is also very important.You should never hold your breath during Arm Exercise
Chest Exercise Isometrics focuses on the strength and tone of the pectorals both upper and lower (the major muscle of the chest), but it also works the assisting muscles of the triceps (back of the arms) and the deltoids (your shoulders).
