It's not about "muscle" peeps
It's "technique"
I'm quite slightly built and only 5' 8" 11 stone and I can get "almost" any bike onto it's centre stand
The majority of modern bike have what are called a "tread down" stands
If I was there I could show you how
Try to "stand" on the extender and let the wieght of the bike roll backwards whilst just "steadying" the bike with 1 hand on the bars and 1 on the grab handle or other convenient holding point
DONT try to "LIFT" the bike (you will only hurt yourself)
Sorry I can't be of more practical help at the moment
I did a few "demonstrations" at the "novice maintenance day" which BM had at Squires a couple of years ago
Maybe it's time for another one