My 5yo DS has SEN and PDA so it can be a struggle to be out with him - he's so close to meltdowns sometimes, so we try to keep demands low. This means carrying him about around often. I used baby and toddler carriers until he was almost 4yo.
DH is tall and strong and can manage no problem. I'm 5'2 and struggle to carry all 20kg of him for more than 5-10 mins.
DH keeps saying I should work out to carry him. This seems ridiculous to me - the amount of time I'd have to spend in the gym to carry him for slightly longer, and I'd have to keep up with him growing up.
I do have access to a basic gym and a gym membership but I hate working out on my own. I go to classes but because of work I can't make it more than once a week. I do think I should go and do more weight bearing work for my own health, but the amount of time I need to spend there, when I have a SEN child and no respite apart from husband who goes to the gym, runs and plays football 5 days a week, to make a marginal gain in muscle mass and carry him for 5 more minutes, seems like a poor use of time.
YABU - I should go to the gym so I can carry a 5yo for more than 10 mins
YANBU - the gym will make a difference