Heart rate monitor on my Apple Watch always seems accurate, but the other day while mowing the lawn it seemed off. I like to log it as a workout since I have a huge lawn and I’m using a push mower. I noticed my heart rate changing by 50-100 points for several minutes at a time and it happened several times while I was mowing. My heart rate is always very regular so I doubt it’s a medical issue and this is the only time this has happened. I want to think it has something to do with the vibrations of the mower. Has anyone else experienced this?