TY JOUR TI P.F. Lesgaft: Conditions for the Formation of a Harmonious Personality KW well-rounded individual and the conditions for its development KW physical education KW essential (irreplaceable) factors stimulating personality development KW child psychotype JO Journal of Applied Research AU Lyubetsky, N.P. AU Mavropoulo, O.S. AU Verina, T.P. AU Agafonov, S.V. PY 2026 IS PB ITBO University