I've met my rape nemesis in raping in the TT position. Dunno how those triathletes do it. Easy endurance is fine, closer to lt1 is fine, but sweetspot/threshold, no chance. Something about doing long stretches of high power on the trainer while tucked in is just soulsucking. Had to call it in after 15min and just proceed on the basebar, and even that wasn't too easy since the drop from saddle to basebar is bigger than riding on the drops on the road bike. Outside the TT position feels fine but inside, nah.