Sara Álvarez, co-founder and creator of the RETO48 methodology, explains what 3-2-8 consists of. The training method that has gone viral on TikTok, a weekly plan that seems simple, but that, like everything, has some rules to follow (and if it is done under supervision, better than better) 8,000 steps a day is a demanding challenge, but affordable, especially if you take into account that "it is not necessary to give them at once"