Well, I am pretty short so I'm not exactly stick thin; plus I have been working on this for a couple of months so I did weigh more when I decided to drop some pounds. Just trying to get fitter in general; cardio fitness, good diet etc.
It's great that someone so young is taking responsibility for their own health - it no doubt shows a high level of maturity considering that most adults fail to do the same. Unless you are under 5'8 I would suggest not losing too much more weight. If I remember correctly, the suggested weight at 5'8 is (by B.M.I) 130lbs - a little low in my opinion.
Thanks for the information, I've had lots of people warn me that tarmac running can cause a lot of problems but nobody actually suggested how to combat them.
Sadly a lot of runners ignore the warnings that their body gives them and follow the definition of insanity - they run, get injured, recover and then carry on doing what they did before, expecting a different outcome and treating injury as something that comes with the territory. Some get fitted with orthotics and see a big improvement, but this is covering up the cause, not fixing it. Strong, self-supporting feet are healthy feet.
I've probably been striking my heel without even realizing considering I'm not clued up on good running form so I'll make a conscious effort to try forefoot/midfoot landing next time I head out.
I'd say it's pretty likely considering almost all running shoes in the past 30-40 years, or longer, have been designed
for heelstriking. This goes against every clue that nature gives us - small children will, almost certainly, run on their forefeet - they haven't been exposed to overly-supportive footwear and so run as we have evolved to. Our lower legs are beautifully suited to absorbing shock - by heelstriking you completely bypass this.
I'll make a conscious effort to try forefoot/midfoot landing next time I head out. I may even look into some more minimalist running shoes because the heels on my current ones are pretty thick which won't help me trying to change landing style.
As a (fairly) experienced minimalist runner, I can give you one massively important piece of advice - take it slow. I'm talking building up by 10% each week - starting from half a kilometre every other day. This may sound like a backward step distance-wise, but it will help with another important aspect of minimalist running - cadence, the number of times your feet touch the ground in one minute - the shorter the stride, the less likely you are to accidentally heelstrike and the less impact you put through your legs.
The optimum cadence is said to be around 180 strides per minute (spm) which is a
killer pace, you'll be thankful you built up from 0.5km when you start hitting 5km+ runs! An awesome side effect of such a high cadence is a high average speed, especially once your body is more used to how demanding it can be.
Of course, always be sure to warmup well and stretch! (especially your Achilles) and listen to what you body is telling you.
If you want to make the change, what I would advise is waiting until the warmer weather arrives, and then running barefoot (wearing socks is good too - just be careful about where and on what you might be placing your feet!) on a soft surface such as grass.
Since the human body is incredible, it will begin strengthening the new-found muscles that you're using and retuning your running form into an effective forefoot/midfoot strike. Without rubber soles and other materials in the way, you can find and learn a very natural and healthy way to run (and develop insanely strong foot and calf muscles).
Run like this for as long as you can (several months, or even the whole of the summer would be great, the new running form needs to become something you do without even thinking about it) and then look into buying some minimalist (but not too minimal) running shoes. The idea is that you can carry your new-found form over to the shoes without losing any of your hard work, and then begin running on hard surfaces again.
Hope this helps, feel free to ask me more if you want to.