I'm a recent vibrams fivefingers convert, i've never been able to run due to pains in knees and ankles, after my knee blew out in january i was researching all things regarding leg health and strengthening exercises to hasten my recovery and got onto stuff about running barefoot and barefoot running shoes, the best explanation i got was to think of a child learning to walk and how quick they are sprinting about barefooted and then you stick them in their first shoes and they are clubbing about like Herman Munster until they relearn to walk in shoes, the extra support from regular shoes negates a lot of supporting muscles in the lower legs making the legs weaker.
I personally was what is commonly called 'a heel striker' when i tried to run, i know now this is and was the cause of all my problems, i started using the treadmill barefoot and you quickly realise you can't land heel down and rolling through the foot without suffering shockwaves of impact pain shuddering up through your limbs, we are meant to run on the balls of our feet more like an ostrich or a veloceraptor runs, heels are for standing still on and for balance, well after running half a mile in this fashion all these old unused muscles come to life and for 3 days afterwards i could hardly walk feeling like my lower legs had ran a marathon, once recovered i done it again and this time the hurt did not last as long, i decided to give the vibrams a shot, fast forward 2 months since blowing out my knee and i am running 4 miles in an hour and only feeling appropriate pains in my legs afterwards which are good strengthening type of pains through all those little muscles and ligaments getting a workout, each run my lower legs get stronger and i find it easier to run on the balls of my feet and toes and each run i feel more and more powerful and ostrich like, yesterday i just bought my second pair of Fivefingers, personally i really really love them and running barefoot and with barefoot shoes has transformed the structure of my lower body, knees are stronger than ever now and getting stronger everyday.
I am still amazed i can now run 4 mile in an hour and i know this will increase week by week, this might seem nothing to folks who can run but i have never even managed to run a mile in my whole life without intense pains afterwards for however far i got any time i tried, even as a kid and i had always blamed being a little fatty as the cause, well i am still 16 stone now and i can run, losing weight steadily week by week too