Advice for summer analysts

Getting ready to start as a summer analyst at a BB in NYC and am definitely nervous like everyone else. I grew up in a small town and also go to school in a pretty small town, so this will be a big adjustment regarding location and of course the job. I knew what to hours to expect going into recruiting but actually being in the office and experiencing it is a different ball game. Analysts, associates, etc that have gone through this already, what did you guys do to adjust and then stay healthy mentally and physically during the summer especially if you were in a "sweatier" group. I know there's a ton of unwritten rules about things you can and can't do as a SA/Analyst (looked down upon to workout mid-day during lunch break or leave early to workout even if you aren't doing anything in office, etc), so any advice or tips&tricks would be much appreciated. In the end, it's only about 2 months but I'm hoping to prevent my health from hitting an all-time low by squeezing in whatever exercise and other wellbeing stuff I can.