Biceps Workout - the value of iso metric contraction Straight Bar Curl (Arm Blaster) • place an arm blaster over your shoulders & pick up a barbell. When using an arm blaster make sure your elbows are pressed securely into the arm crevices. Breathe out & raise the barbell upwards towards your shoulder. Hold momentarily in the iso metric contraction, then slowly lower the bar back down until your arms are extended. #biceps #workout #fitness #nike #model #strong #motivation #gym #bodybuilding #tra