Now that I'm getting back on the bike, I keep doing rides with really big intensity factors. Usually > 1.2, my weekly hill repeats are 1.5+, even when I'm fatigued it's high. It sounds like I need to do an FTP test. But I've barely been on the bike all winter, no long rides, whenever I would have had time for that I drove to Snoqualmie and went skiing instead. Is it possible that cross country skiing could have raised my FTP?