Maybe, could also be related to blood sugar, i.e. If you train on an empty stomach and aren't used to it, or if you had a high sugar meal and are crashing.
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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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