# Defense Warm-Up Exercise Material for 13-Age Athlete Using Video Technology in Covid-19 Era

> Research article (International journal of human movement and sports sciences, 2021) · cited 39× · AI/ML

**Wikidata**: [openalex:W3166330031](https://www.wikidata.org/wiki/openalex:W3166330031)  
**Source**: https://4ort.xyz/entity/defense-warm-up-exercise-material-for-13-age-athlete-using-video-technology-in-covid-19-era