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This exercise primarily develops the pectoral and deltoid muscles but the core muscles doing static work and the triceps are working actively as well.You can perform flyes in several positions and with several different equipment but the basic rules are always the same. In this case grab the TRX, slightly bend your arms at the elbow, your palms should face each other, elbows facing outwards, then your arms should be in this position at shoulder height extended forward, your legs should be in a straddle – this is the starting position.  By opening your arms let the TRX to the side of your torso then slowly go back to the starting position. Inhale when opening up and exhale when you return to the starting position. It is an important rule that the elbows shall be slightly bent all the time and that this position does not change during the performance of the exercise.