Go out for a walk the next day, don't do waist and abdomen exercises, avoid waist and abdomen exertion, bend down as little as possible, walk more to promote blood circulation, drink more hot water, and eat the same as the first day!
On the third and fourth days, you can do some simple aerobic exercise, such as jogging, and add some foods with high protein content to your diet.
You can resume strength training on the fifth day, and your period is almost over. I can only see you next month! But do abdominal exercises, if you feel pain, please stop abdominal training immediately and do stretching and other exercises!
Note that you can't do belly rolls, push-ups, running fast and heavy weight training during menstruation! My abdominal exertion during menstruation will cause menorrhagia and even uterine displacement! The most suitable exercise for my menstrual period is yoga, simple aerobics and simple upper limb strength training!