When's the best time to exercise during a menstrual cycle?

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Athlete Dina Asher Smith recently pulled out of the 100m race in the European Championships after suffering with cramping. She told the BBC that more research needs to be done into the effects of periods on athletes' performance. Abbie Lawson is the owner of the Women's Wellness centre in Dorset. She explained to Women's Sport Show presenter Fern Balch when the best time to work out is during a period.