Heavy tired legs whilst riding?.

Hi All
Could anyone give me some advice on tired legs.
I am riding approx 40 miles on a cycle day out but my legs seem to give up and go heavy and tired but i am not physically tired just the legs seem a problem is it my food or fluid intake that could be the issue?.
Thanks Jay.
Could anyone give me some advice on tired legs.
I am riding approx 40 miles on a cycle day out but my legs seem to give up and go heavy and tired but i am not physically tired just the legs seem a problem is it my food or fluid intake that could be the issue?.
Thanks Jay.
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