As I said, I don't do randori feeling cold... I just start off being warm most of the time... You're upping the blood-flow around your body by doing that exercise, mine is already up enough that I can get straight in when I get to it, 100% without having to specifically 'warm-up'.. I am warm, as if I have warmed up... I'm as warm as anyone who has warmed up, I have as much blood flow as anyone who has warmed up. I check my movement, I naturally move around the mat a bit, you know, but I don't need to push myself in order to become warm. Other people need to get themselved pumped up before they can take 100%/jerking type actions and pushing themselves without getting injured; I don't need to do that as I already have the blood-flow... Other people go in dead and have to wake up their body and mind, and transition to Judo mode before they can start, but I am already there... there is little transition for me. What is your diet..?
Many people feel they even need to warm up before running, jumping and what not, and they do, and I would too, if I was cold in the first place... But I'm not, I'm not cold, I am warm, because I have warmed up, but I was never cold, so I haven't had to push my body to make myself warm.. how do you not understand? I am warmed up just moving around as I normally do, without having to 'warm up'. My body is doing stuff, and I have blood-flow... I do not arrive dead to the mat and kick-start my engine. My engine is already running, I just engage the clutch.