Bring sandbags during running practice, will the calves become thicker because of sandbags?

Holding sandbags won't affect your grades, but after long-term heavy-load running training, your calves and thighs will thicken, obviously, just like your brother … but I don't think running with sandbags will greatly improve your grades. I seem to feel as light as a swallow in a short time, but I will soon return to normal.