manche vertragen mehr.
...und manche weniger!

Oder um es mit Bell et al. zu sagen:
The physiological stimuli directed to skeletal muscle as a result of strength training and endurance training are divergent in nature (...)
...the majority of research has supported the contention that the adaptations to strength training are different when combined with endurance training and the physiological basis for this may be linked to an interaction between an elevated catabolic hormonal state leading to a reduced change in skeletal muscle cross-sectional area.