Find one under long bench.
Also one in cupboard.
Another one in t-rod box.
One behind wall panel.
One in sand bag.
Find one behind the 4 big plates in the corner and One behind small mirror.
One in middle door of red cupboard.
One under the black weights of the pulling machine after putting the t-rod on s-rod.
By the way, you can also share your own hints and Gazzyboy Gym Escape Walkthrough below. Play game here.