Probably both, I know when I am sick that my endurance is crap. But if you are used to doing only 5 rep sets as well, than higher reps are difficult at first.
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James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano
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