Sure, but I don't think it is reasonable to perform a single physical activity if your goal is maintaining good health anyway. There is a neeed for resistance training, cardio, mobility and balance. E.g. lift weights, ride a bike, do some yoga. It is only a matter of finding activities that you enjoy.
I don't think that's reasonable at all. I ride and trail run regularly, and the amount of time that it subtracts from my nerd hobbies is *immense*. Other poster is right, the 99th percentile regular non-professional shredded athletes I know do one thing consistently.
Since you are spending an *immense* amount of time trail running, have you contemplated the pros and cons of reducing some of that time commitment and complementing your running with other physical activity to build other areas of your fitness beyond endurance?
You do you, but it's a bit like somebody consuming only large amounts of meat and somebody suggesting that it may be beneficial to reduce some of that and balance the diet with some other nutrients.
I'm more tempted to stop running again. I am less skilled at mountain biking today since I moved to a 1:3 weekly schedule (4h running and 6-16 hours riding). Our insane single friend who XCs from summit to summit 7-14 days straight 3mo/year is enjoying my conjured dream.
Health isn't my goal, it's a second-order effect. I just know that you can achieve top 1% fitness without the time-consuming yoga and gym routines.
