for me its different for every horse I ride and what i'm riding that day i ride three:
Jumping: walk to hitch, trot circles untill confortable, go over short jumps, canter once or twice around, raise jumps
other: suntract the jumps
arena: walk to arena, trot, perimiter, canter perimeter, running walk perimeter, trot one gaming event
trail: walk for a quarter mile (ish) trot for a little no running till warm
arena: walk to arena, trot perimeter, trot a gaming event or two,
trail: same as walker
for the morgen sometimes I have to lunge, if she feels hot or if she hasnt been ridden in a while, because she gets hard to handle when she is hot.