Originally Posted by Kyle Borowsky
This sounds rather far faetched. Do you have any documentation supporting such a claim? In theory any exercise could give someone rhabdo if they are poorly hydrated and the physical activity is too much for them (whatever the definition of too much is for that individual person). I doubt doing jumping pull-ups would cause this unless you have preexisting condition
Matt Swift from CF Brisbane had a confirmed case of clinical rhabdo in one of his clients from resisting the negative in jumping pull-ups
We've had two people on the Brand X forum develop clinical rhabdo from resisting the negative in jumping pull-ups and for that reason we you no longer see jumping pull-ups prescribed as a sub for pull-ups in the Brand X scaled WODs.