...forget the gym
unsubscribe.
Forget all you know.....
if you want to work your shoulders and uper arms, if you want your arms like jelly and your shoulders shaking with the efforts.......
get a new extractor fan for your toilet.... stand on a little ladder.... and with all the power off for safety, spend 2 1/2 hours with your arms above your head, trying to fit it.
Obviously this is only viable if you buy slightly the wrong version of the extrator, and don't realise for several hours. but still......
if you want arms that won't lift above horizontal the day after .....forget the gym