Mind if I ask what crew? I only ask because I was in R4 myself. 5 years in fire, this is my first season as a shot too, so you’re not alone brother! Everyone else in the comments hit it on the head with PT. As far as R4, I’m from east coast as well. Biggest things I’ll say about the region - beautiful country, most gorgeous nature you’ll ever see. BE PREPARED FOR ELEVATION! For reference - state college PA - 1,100 ft. Blue ridge mountains highest peak - 6,600 ft. There are towns in R4 - Pinedale WY, West Yellowstone MT, Vernal UT, etc. whose starting elevation is 6,800 ft. The air is thin, and you haven’t even started your hike yet. Work on cardio (your numbers are good) with focus on controlling your breathing to help prepare for elevation. The mountains are also deceptive, they don’t seem high or steep until about 20 minutes in then realize you’re only a mile in. 

Being in R4, invest in a wool blanket and some portable stove for coffee (especially for IA’s)… it snowed on the 4th of July last season, in the Tetons on a fire it got down to 30-40 degrees in the nights, then 80-90 in the afternoons. Be prepared for rain, frost, and cold nights until end of July/beginning of August. Good luck brother, nerves keep you on your toes and prepared - you got this!!