Increased weight! – that is like kryptonite to TFD. I agree NO WAY.
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walk vs run form – it depends…
Consider a continuum. Walking slowing on one end, running fast on the other.
o=walkslow===walkfast=/=runslow===runfast=o
I would agree that walking and running are quite different at the opposite ends. Slowly walking versus sprinting. However, someone like me who walks fast and runs slow, the only difference is cadence.
My gait in both has the same: form, midfoot, lean from ankles, head up, and upright posture. Just faster steps when running. And both feet off the ground between strides when running versus one foot on ground between strides when walking.
Carrying a pack while walking fast all day with minimalist shoes is unknown territory for me.
I've tried low miles (6 mpd) with no problems carrying about 30 lb. No problems.
My theory is that minimalist shoes will work better the lighter your pack is if you want to hike at a good pace all day long (20+ mile days). I believe <20 lb for +20 miles or somewhere +/- few lbs and miles.
Here's what I want to test: minimalist shoes work for lightweight backpackers who hike all day.
I will get back with you later next week with the results of my first test.