I have been steadily building my CTL over the winter (this is my first season using TSS scores) and currenlty its in the high 70's. I am soon to go skiing for a week and am loathed to see this drop back to the low 60's. The last few years I have been skiing, during the 8 days away I ski 6 full days and go for 4-5 1hour runs. So my question is can I attach any sort of TSS score to this? I'm thinking I already know what most of you will say to this but then again my thinking is that my cycling fitness won't drop as much over 8 days of fairly high activity as 8 days of no activity at all.