sorry adarq for this:
what i mean by the holding stop watch ruins mechanics is that instead of focusing on running i also have to think about starting and stopping the stop watch and since im right handed, i have that on the floor and i have to use my left hand, which is hard.
but that is the only way i know. but i have stopped as the hypertrophy phase is coming.
the 8.48s was timed some time ago and the 3.99 was measured recently, but it was measured by a kid, so that may not be a reliable reading.
Luckily enough i will be joining a local track near the uni im going to.
you're right about following the 10s advice a bad habit of trying to learn everything up to professional level.
I will be getting my 100m timed every week, i will try so i can measure progress every week at the track. i will get back to you my current times and then will see how i progress.
thanks again for the help and sorry again adarq for the hijacking.