adjustable hydraulic power twister arm exerciser 22-440lbs home chest expander muscle shoulder training fitness equipment arm enhanced exercise strengthener grip bar abdominal builder (blue) reliancer <b>warm tips:</b><br> 1.the buckle are just for holding the two arms of power twister together,please don't use it as a handle,avoid the buckle falling off and power twister falling on you!<br> 2.please choose the intensity that suits you so as to avoid muscle strain!<br> 3.not recommended for use by children,pregnant women and those who feel unwell!<br> 4.please keep out of reach of children and pets to avoid hurting your baby<br><br> research shows it is very dangerous to use spring power twister,hydraulic power twister is safer and more durable becasue of the patented hydraulic adjustment system principle.<br><br> <b>what’s spring based exercisers disadvantage?</b><br> springback is violent,easy to hurt you<br> the spring in the middle will easily pinch youself<br> the spring is prone to break after prolonged use<br> the resistance strength will weaken over time<br> the opening angle of the arms and motion track will change if you adjust the resistance,you have to change your arm movements what your muscles are already used to!<br> the exercise effect will be greatly reduced because your arm can’t fully open when you use spring power twister!<br><br> <b>what's hydraulic arm exerciser advantages?</b><br> won’t rebound and hurt yourself!<br> there is no danger of the spring breaking<br> totally-enclosed hydraulic cylinder which offers you stable resistance strength,will not weaken over time!<br> with unique safe hydraulic adjustment system principle,even if you change the resistance,the opening angle of the arms and arm movements won’t change,so you don't need to change arm movements<br> you can fully open your arm even you reduce the resistance<br><br> are you still using inefficient and dangerous fitness equipment?you should select a safer and more effective arm fitness equipment for yourself!<br> please throw away those spring power twister,try our hydraulic power twister!