power twister bar-arm hand gripper 20-60kg home gym fitness bars grip bicep triceps pectoralis workout spring arm strength exercise expander

product name: spring hand gripper arm exerciser grade:20-60kg weight 1kg function:biceps spring arm strength expander 1.back and shoulders workout: flex your back and back shoulders by squeezing the flexbar towards your middle back. 2.exercise your chest by bending the flexbar inwards, similar to pectoral flys, providing resistance through your entire motion. 3.perform curls with your biceps and forearms. full resistance is provided all the way through unlike dumbells, giving you maximum resistance throughout the exercise. 4.package includes :1xpower twister