Practice your cross skills in a grassy park that offers a place to work on dismounts, remounts, barriers, hills, and a sand pit if possible.
Do 30 dismounts and remounts (mixture of barriers/hills)

20 Min Threshold Effort up a climb or on an uninterrupted stretch of flat road to determining training zones.
Find an uninterrupted stretch of road, free from stop signs/lights or longer descents. This needs to be a repeatable effort as you may test throughout the season. Your goal is to put out the hardest effort you can for 20 minutes, but also to be smooth & consistent as you perform the effort. Don't blow up in the first few minutes!

Start your warm-up 40 min before your field test.
Spin easy for 10 minutes to get the legs moving. Then do:
2x10 min ON, 5 min OFF @ Sweet Spot.
Spin for 5 min easy.

Let's work on your core strength today- here are some suggestions:
V-sits:
http://killercoach.com/wp-content/uploads/2017/05/V-sit-variations.pdf
Monster Walks:
http://killercoach.com/wp-content/uploads/2017/05/Monster-Walks-with-Rubber-Band.pdf
Single Leg Deadlifts:
http://killercoach.com/wp-content/uploads/2017/05/Single-Leg-Deadlifts-with-weighted-ball.pdf
perform 3-6 sets of each

Work on stretching your hamstrings, hips and calves today....A little foam rolling goes a long way too.
Check out this helpful video: https://vimeo.com/214200414

Pre-Race Openers. Short quick intervals, designed to "open" your legs up for the very next days race pace efforts. Do these on your CX bike on the course (if possible). Openers: 2 x 1 min ON, FULL GAS, 2 min OFF, Then 10 min Zone 2 recovery, then 2 x 30 sec ON 1 min OFF, also FULL GAS, then 10 minutes OFF. Also perform 2-3 race starts from an imaginary start line for 10 seconds. Get in the ZONE ! ! !

Today is your pick on what type of ride you'd like to do! Have fun!