Endurance training Participants will commit to follow a polarised triphasic endurance-training model. This model contains three intensity zones calculated as low intensity [< the first ventilatory threshold (VT1), ~ 70% HRmax]; moderate intensity [between VT1 and respiratory compensation point or ventilatory threshold 2 (VT2), >70 < 90% HRmax]; and high intensity [>VT2, 90% HRmax]. Participants will train 5 to 6 times per week with a total percentage distribution of 75 to 80% at low intensity; 10% at moderate intensity, and 15 to 10% at high intensity.