This is actually fairly easy
First load up the challenges and select Obstacles
Second select Easy
Then select the course EZ EZ
For this course your goal is to finish in under 4 seconds, so retrying is fairly quick and painless. The way I did it in about 3 tries was to hold
from the beginning and right at the end just move the
a little to nip the goal.
It's really easy and can be done fairly quick, good luck!