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In order to respect your 2019 resolutions, here are handles for unstable equilibrium pump on a spherical surface.
For even more intense muscle work with the spherical surface that causes instability. Improved ergonomics for the benefit of classic hand-ground pumps.
You can also not use the half sphere for less unstable and less physical work.
Multiple handle version available for even more motivation:
No pain no gain
Never give up
Go hard or go home.
Glue the two clips in the half sphere.
Insert the half sphere and turn it to engage in the groove.
Cut a steel or aluminum shaft Ø8 length 125,5mm.
Insert the pin into the handle and insert it into the base grooves.
Print possibly the simple handle with a flexible filament ..
No support needed.