The control group will not undergo the training program.

Training performed under normoxic conditions (223m), stay and sleep in normobaric hypoxic conditions (3000m) and thermoneutral conditions (21°C) and constant humidity (40%).

Training performed under normobaric hypoxia conditions (3000m), stay and sleep in normoxic conditions (223m) and thermoneutral conditions (21°C) and constant humidity (40%).

will stay and sleep in normoxic (223m), and train in normobaric hypoxia (3000m)

Training performed and stay and sleep in normoxic conditions (223m) and thermoneutral conditions (21°C) and constant humidity (40%).

Participants will engage in interval training and will reside and sleep at different altitudes for a period of 4 weeks. Aerobic and anaerobic capacity tests and an eccentric exercise test will be performed before and after the training intervention. Before and after the training program, somatic measurements will also be taken. Before and after the first and last workout, blood will be drawn for biochemical analysis.

Measurement of maximal oxygen uptake and determination of ventilatory thresholds (ergospirometry)

Measurement of maximal anaerobic power (Wingate Anaerobic Test)

Indicators of prooxidant-antioxidant imbalance, markers of inflammatory status, markers of muscle damage, markers of intestinal damage, HIF (hypoxia-inducible factor), EPO (erythropoietin), markers of mitochondrial metabolism, morphology (including reticulocytes).

Body composition analysis ( body height [m], body mass [kg], Quetelet II Index [kg/m^2], lean body mass [kg], fat mass [kg], fat percentage [%] and total water content [kg]