Exercise (maybe) fruit picking- not in current list

So I'm going berry picking today, any clue how to log that for exercise? I think its mostly going to be the walking but I'm not sure? Is it comparable to cleaning the house or something you think? Just wondering how I should try to log it. I know it's not hardcore cardio or anything, but it's certainly not sitting around converting oxygen to carbon dioxide.

Thanks for the help!

PS no heart monitor or I would go that route