Is a persons fat contagious?

First, I don't want people to get "contagious" confused with "heriditary"....I know that being fat or obese is heridiary. But, I also wanted to know if fat is contagious too. I started going to the gym and ironically, I started gaining more weight since I've been there. There are overweight people on the treadmills on each side of me everytime i go, so I was wondering if their fat contents could transfer into my body by their sweat. Like, if an overweight person was always working out on the treadmill to the LEFT of me, would only the LEFT part of my body (50% of it) become fat? My friend told me that I could possibly wear bug spray to prevent this? Is that true? Someone please, I need answers!! I'm starting to reconsider my membership at the gym and just start working out at home. I certainly do not want to work out in a place to lose weight if fatness is contagious. Thank you everyone!