Steady mode always goes at the speed the ride was filmed. So if the person filming it went up a 10% gradient for 5 mins, so will you - No matter how hard or easy you go. This is great if you want to do a session or effort for a set amount of time or if you want to ride with someone who’s fitness level is different to you.
In reactive mode the videos speed up and slow down depending on the amount of power you are producing.
Challenge mode works the same way as reactive mode, but you can choose a “ghost” effort to race against. That ghost can be someone else, or a previous effort of your own. It’s by far the most addictive mode in FulGaz and a great way to make sure you finish a session.