With days getting shorter now in fall in Oregon, I am starting to run out of daylight on long days (20-30 mile range). Last year, I used to walk/ trail run if pressed for time. This year I seem to have picked up some chronic sacro iliac joint injury (probably from snowboarding) that makes running quite painful even after several doctor visits. Walking or cycling don’t seem to hurt at all.
So I looked at the net and there seem to be three choices till my injury heals: 1) racewalking 2) chi running 3) POSE running. I read the book on CHI running and I guess both runnign methods look similar. Racewalking is pretty straightforward.
So, for anyone who has thought about this problem of trying to walk moderately fast (say 4-6 mph), is it better to racewalk or go to one of these low impact running styles. For me, efficiency means 1) lower energy consumption per mile at that speed and 2) lower joint impact/ injury.
I am sure at high speeds (say > 8 mph), running will be more efficient and at slow speeds (<3 mph) normal walking is obviously more efficient. In the middle though maybe racewalking or these modified running styles may make sense

