Standing at the cache hide, there are many ways to get fit in the vicinity. The footpath is a lovely walk, run, horse ride or cycle ride and runs from near Bull Beck car park, east of Caton to Glasson Dock
More info on the footpath and cycle path here and here
The River Lune itself is often used for rowing and canoeing
Info on canoeing trips on the Lune
There are also two gyms within easy distance.
And, of course, you have walked to this cache! Getting fit!