I sparred a huge bodybuilder boy recently, enormous biceps, showy muscles. Pretty quick, I realized his feet were much slower than mine. Proud I got that read. And I made good use of it, kept sniping him with combos and getting out quickly. Basically the clichΓ© lumbering muscle-bound giant he was.
Working on getting to the anaconda choke when boys are turtling. PS: like this: https://www.youtube.com/watch?v=vOlOmHRDyLY

Yesterday I tomoenage'd a guy who'd represented Poland at the national level. π
I need to drill out a bad defensive habit caused by boxing gloves: shelling up in defense with the hands resting on the face. Works great with boxing gloves, but boxing β fighting.
Having said that, my striking defenses have really improved in the past month. I frequently see entire combos coming and go block-block-block with no panic no hurry.