Both physical exercise and age can cause spotting and short menstrual bleed duration. If your mum started having menopause
signs around your age, then age is more likely a cause than the exercise. But as I said earlier both can cause menstrual perturbations.
It is however advisable to see a specialist (OBGYN
) for spotting and menstrual perturbations can be due to causes other than age and exercise. Enjoy your exercises, for its good for your health. :-)