Paranormal Investigations: Physical or Mental Fitness?

I’ve always been curious about the balance between physical and mental demands in paranormal investigations. On one hand, you might spend hours in uncomfortable or remote locations, which seems like it would require solid physical endurance. On the other, facing the unknown and staying calm under pressure calls for strong mental resilience. For those who’ve been on investigations, which aspect do you find more critical? Do you train differently for each, or does one naturally support the other? I’d love to hear your experiences and tips!