title: Feasibility of an 18 months' physical training program for middle-aged men and its effect on physical fitness.
mesh_terms: D000328:Adult; D001290:Attitude; D003327:Coronary Disease / Q000517:prevention & control*; D005387:Finland; D006173:Gymnastics; D006801:Humans; D007869:Leg Injuries / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000293:injuries; D010101:Oxygen Consumption; D010352:Patient Dropouts; D010806:Physical Education and Training; D010809:Physical Fitness; D012621:Seasons; D013177:Sports; D013997:Time Factors