I'm around 6'3", 240 lbs. I've gotten single digit greats on all but 2 songs from Extreme. I have no problem using the bar (even though I play most no bar). I have no problem playing doubles. I have no problem sdg'ing PSMO most of the time.
Height can make some things easier or harder, but in the end, it just comes down to overcoming it. Cover up your playing weaknesses by GETTING BETTER, not blaming stuff like your height.
If you've got low stamina, play courses or long songs on ITG. If you've got trouble with foot speed, play with ankle weights, or play 10's, or play 10's with ankle weights (I did 15 greats on max300 wearing 10 lb ankle weights once. that was a fun day lol.). If you have problems turning (SUP ITG) play charts with lots of turns and actually DO the turns.
It really just comes down to self motivation
On a related note, I saw a guy who had to have been 6'11" (his face was even with the top of the speakers while on the pad) playing BIMP on doubles rather skillfully. Quite impressive to watch.
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