https://www.vitamarg.com/health/sport/10679-zachem-nuzhna-fizicheskaya-nagruzka
vkvikingi.ru/raznie-novosti/polza-fizicheskoj-aktivnosti 28.10.2018 407 Less than a minute https://www.vitamarg.com/health/sport/10679-zachem-nuzhna-fizicheskaya-nagruzka
