This can be something you work up to, over time.
Ive done this twice.
I do ten strokes, stop and kegel.
Jerk till im 85 percent 90 erect
Then do 10 more strokes
Until i hit about 200 hundred strokes
Hoping this routine will gain me size
Can you explain how jelqing scientifically increases size?
Do you think putting strain on my penis 30 minutes a day will give me gains through jelqing?
It's doubtful your 200 reps are even close to 30 minutes of activity.
A 30 minute jelq session is a very advanced level of volume. If you're not accountomed to 30 minutes of jelqing then you could injure yourself severely.
"Strain"? To be clear- the goal is to maximize quality tissue stretch- not to brutalize the penis!