Introduction of electronic devices in the test of flexibility. - KORYAHIN, VICTOR; IEDYNAK, GENNADII; BLAVT, OKSANA; GALAMANDJUK, LESIA; PROZAR, MYKOLA; ZAIKIN, ANDRIY; VESELOVSKA, TAISIIA; GOLUB, VICTOR; KUCHER, TETYNA; GURTOVA, TATYANA (Journal of Physical Education & Sport, 2020)