Fammers lifts , gym just ain't big enough so would it work to do my gym routine as normal and then to finish off pick up some seriously heavy dumbells and just hold them on the spot for as long as possible ???
Although heavy dumbbell can be a good exercises. The movement of walking challenges the grip more as well as really working the core.
Best thing to do is lengths of the gym if possible. If this isnt possible then heavy dumbbell holds is the closest option.