Nothing to do with the unnatural amount of weight already compressing their chest of course.Used to work in a small team that was split between several buildings on the same site. We often had to carry boxes of equipment between the buildings depending on where we were working. One person was morbidly obese and refused to carry anything as they claimed carrying stuff made their chest feel tight due to their size. That got people's backs up as they felt that person was just being lazy. One of the team fell pregnant but was able to carry stuff right up until she left for maternity leave. People were happy to carry the load for her out of courtesy, even though she didn't need help. Just thought it was interesting how the two people were treated differently.