How do you deal with pain when running? The onl;y thing holding me back from a sub 12 minute run is the fact my ankle/achilles tendon have started being very painful recently. I've just started training/running (I tested myself with no prior training and got 12:30) I did some interval training the other day and it feels as though my ankles and achilles tendon are just seizing up. Not sure if it's the sort of pain I should grit my teeth and bear or if I need to change something before I damage myself.
The Ultimate Runner's Guide to Achilles Tendinitis
Tendon problems don't tend to heal that fast because tendons have a crap blood flow to them (so I've been told).
I think the problem is that you've done speedwork (intervals), without any base training (easy running). Ideally people should do about 3 months of base training before adding speed. Maybe young whipper snappers can get away with it more than middle-aged types like me. But not you, obviously.
And if you want to put weight on, weight lifting will be needed, but you'll also have to substantially increase your calories. A weight gain supplement might be the easiest way to do this.