I’ve experimented with this a lot over the years having been various at Bodyweights and body fats for different reasons. At 6 feet, My body feels the best at around a very strong 205#. The worst I’ve ever felt was being extremely lean doing a lot of distance running and Rick climbing at 155#. Back pain, join pain etc. ~15% bodyfat seems to be about the ideal percentage for performance. Any less than that and I start getting some aches and pains. I do seasonally drop down to about 190-195# during peak Mtn Bike season and I start to perceive the nagging aches and pains again. That quickly goes away once I do a strength cycle and gain 10-15# back. I have been as heavy as 220# before and also at peak strength at that weight, but it felt a little too chunky for me and that’s not really a sustainable weight for me anyway.
As far as the endurance aspects of snowboarding and Mtn biking, I’m the biggest/heaviest of my partner pool by far -often by 50-70 pounds. It’s a compromise when it comes to sustained climbing in either sport as I can often be a bit slower, but my body feels strong and solid, I’m not complaining about aches and pains and I’m far less prone to injuries as a result of crashing or repetition. It seems like they guys who have overspecialized, really small bodies are always experiencing body pain and discomfort of some type, especially in their backs. I always tell them they need to be a bit thicker and generally stronger if they want longevity, but they aren’t having it.