run lots of high quality tempo upwards of 70% and
focus on keeping the hips and knees high till the end at lower speeds first compared to race pace(I see too many people, that can’t hold form, going for distance or shooting for total volume when doing tempo runs.It just depends on your goal.)
You need to be super fit to run that second 100 as effectively period.(I mean super fit to run the 200,not just the 100..and throw in a 200 here and there in comp)
focus on relaxation and technique all the way through
run the curve…practice,practice and practice, not just when doing 200’s, run alot of 80,100 and 120’s. The more efficient you get at running the curve,the more energy you’ll have left for that last part.
learning to transition from running the curve to run the straight should give you kind of a slingshot effect if you do it properly
as for the mental aspect of it, I try to approach the second 100 as just”go there and have fun ”instead of thinking like ”ahhhh it’s a looooong 100”, out of the curve, just let it go!
(btw I’m not saying I’m mastering all those things either,I’m just sharing some of the information that I feel I’ve been fortunate enough to be taught along the way)