Got you ! It's a trick question. It's NEVER too early to talk Cyclocross!
While I approach Cyclocross with a historic (for me) amount of base training, I must confess I was absolutely schooled on the team ride today. Very early on the throw down my legs felt tired and then they felt tight. Like I was wearing a pair of shorts three sizes too small. I had felt tight before the ride and had been sliding on my stretching, but I was sucking.
I backed off and then noticed some clicking in my drivetrain. I looked down and saw my rear cassette wobbling. "Loose cassette," I said to myself. It got worse and soon I was forced to confine my riding to the two highest cogs (12t, 11t). This was great until on the return trip the road started going up and down and I couldn't downshift. Maybe you heard the "pop" as I went off the back a second time.
When I got home I pulled off my cassette. As if I was superman, I had sheared off the cogs front the spline. I stopped in at Gregg's cycle and asked them if they could share this with SRAM. I'll keep you posted.
Flexibility and intervals are in my future.