But the former Team GB competitor revealed how the opportunity to take part in the physical challenge was positive for both her physical and mental health.
She said: “It’s like I’ve been given this amazing present, because it’s de-stressy: after every single bike ride, swim, run, I feel that the world is an easier place to be.
“I’m less stressed, I’m less naggy. Throughout the menopause as well, it’s been hugely helpful. My daughters will say, if I’m getting a bit angsty, ‘Mum, do you feel like going for a run?’”
Louise’s Sports Relief adventure will air tonight at 8pm on BBC One.