Or you can start taking a vitamin D supplement to increase your levels. You can check your vitamin D levels at home as part of a vitamins blood test.
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Al-Eisa, E. S., Alghadir, A. H., & Gabr, S. A. (2016). Correlation between vitamin D levels and muscle fatigue risk factors based on physical activity in healthy older adults.Clinical interventions in aging,11, 513.
Barker, T., Henriksen, V. T., Martins, T. B., Hill, H. R., Kjeldsberg, C. R., Schneider, E. D., Dixon, B. M., & Weaver, L. K. (2013). Higher serum 25-hydroxyvitamin D concentrations associate with a faster recovery of skeletal muscle strength after muscular injury.Nutrients,5(4), 1253–1275. https://doi.org/10.3390/nu5041253