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Hard relative to being in a fasted state is probably a better way to put it, hardly the rolling on the floor dying kind, 5x8 min intervals increasing by 2% incline but decreasing speed each time.
I was sucked in by the Limitless doc on Nat Geographic which cites the benefits @Acliff listed!
Philipflop
Acliff
Doing a 4 day fast seems daft enough... But adding in a hard interval session too?! Just seems like a recipe for muscle damage, slow recovery and maybe illness and injury.