We saw a similar Timed Trials challenge in Season 5, so I guess this is becoming another regular appearance in Epic’s Battle Pass.
In any case, once you reach these Timed Trials you simply activate them and then run the course, reaching each timer icon before the clock runs out. These can be tough, and you’ll likely need to build some ramps and/or knock down some obstacles in order to complete each one.
In fact, from what I can tell of the locations so far you’re going to need to build a lot more than last time, making this a tougher challenge all around.
Thankfully, this season you only need to do three. That suggests to me that Epic noticed a lot of Battle Pass holders never finished this challenge in Season 5 and want to change that for Season 6.