Our expert says:
It could be a number of things. Most people immediately think of vitamin deficiencies and this is possible and worth looking at with a doctor who can do tests. Things like Iron deficiencies are sometimes responsible.
The next is possible change in seasons - it's a lot hotter and the heat can be draining, often taking a couple of weeks to get over or used to and it may go away naturally.
The third is that you are overdoing it. I can't say this for sure, but you can perhaps play with the frequency of exercsie - take a week of more rest than usual, and it might work. Also, perhaps it's not a great idea to do more than one strenuous session a day, I don't know how you are going about the problem.
I hope that this helps you, it's likely that some rest will sort it out, unless there is a vitamin or mineral problem which would be detected by a doctor.
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