I don't have that rough experinces. My might the most roughest experience was my summerjob at a strawberry patch few summers ago.
Stay there 7hrs per a day, picking, picking, picking. Mainly in the same position, hunched or squated, repeating the same movements. The sun shines without a break most of days during that 7 hrs, almost none speak the same language with you since most of your compatriots think they're too noble to do work like that. After few days you're so sore because of not ergonomic position that you aren't almost able to sit down or stand up.