TY JOUR TI Psychological aspects of teaching students exempted from practical physical education classes KW physical culture KW the students completely released from practical training KW the future engineers KW health improving physical activity KW health KW sports competence KW progressive muscle relaxation KW breathing practices KW ideomotor training JO Living psychology AU Lazarev, S.. PY 2014 IS 1 PB Ltd Radomir-M+