Our expert says:
That stiffness is not unusual when you start. It's caused by microscopic damage to the muscle which then has to be repaired. I won't bore you with the details of how it gets repaired, but that's why it gets stiff.
Once your muscle gets adapted to the training, then the stiffness goes away. You needn't be concerned about it - if you keep getting muscle stiffness at this stage, it would actually be a concern. Tired muscles, yes, and if you do really hard training, then maybe you'd feel some stiffness walking down stairs. But stiffness is a 'rite of passage', that really only happens when you start out.
What would be more concerning is if you start feeling that you're not getting fitter, or if you're unhappy with how you're adapting to the training. If those are OK, then you're OK, so just keep going, you're on track!
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