The 3-month intervention consisted of a physical exercise program, including 3 sessions of training per week (on Mondays, Wednesdays, and Fridays). A total of 36 training sessions were carried out for each group. Training was performed under the supervision of a qualified and certified fitness instructor, and under medical supervision, in a professional training room situated in Sport Club City Zen, Poznań. Group A underwent endurance training on cycle ergometers (Schwinn Evolution, Schwinn Bicycle Company, Boulder, CO, USA). Training sessions consisted of 5 min of warm-up (stretching exercises) at low intensity (50-60% of maximum HR); 45 min of training at an intensity between 50 and 80% of maximum HR; 5 min of cycling without load, and 5 min of closing stretching and breathing exercises of low intensity. Group B underwent endurance strength training, which consisted of 5 min of warm-up (stretching exercises) of low intensity (50-60% of maximum HR), a strength component, an endurance component, cycling without load, and closing exercises. The strength component involved 20 min of strength exercises with a neck barbell and a gymnastic ball. To allow muscle power to regenerate, the strength component was variable and repeated regularly every week. On Mondays, upper limb exercises were performed with a neck barbell; Wednesdays involved spine-stabilizing exercises, deep muscle-forming exercises, and balance-adjusting exercises with a gymnastic ball; on Fridays, lower limb exercises with a neck barbell were carried out. The exercises were repeated in series. The number of repetitions of each exercise in the series was dependent on the subjects’ muscle strength and was equal to the number of repetitions performed correctly. The number of repetitions was systematically increased with the increase in subjects’ muscle strength. Between the series of strength exercises, 10- to 15-second regeneration pauses were taken, during which subjects performed isometric exercises. Directly after the strength exercises, the subjects underwent 25 min of endurance exercise on cycle ergometers (Schwinn Evolution) of intensity between 50 and 80% of maximum HR, 5 min of cycling without load, and 5 min of closing stretching and breathing exercises of low intensity. HR during training was monitored with a Suunto Fitness Solution® device (Suunto, Vantaa, Finland). Both training programs were comparable in exercise volume and varied only in the nature of the effort.