Can I change the difficulty level during my training session?

According to your equipment, it's possible to change the global difficulty of the video from the app. 

If you have interactive equipment, you'll see a difficulty option with a '+' and '-' button : 

100% difficulty means the original difficulty is applied. You can change the difficulty from -50% to +50%.

There is a small difference in BH equipment : 

As the resistance can only be changed by the console, you see the resistance applied on your bike: 9 and the (+5) value means that you added 5 more levels than the original one. 

The original level should 4 but the user increased to resistance 9 on his bike. 

For users having non-interactive equipment, here is what you'll see:

As we can't control the difficulty of your equipment, you have to apply the resistance percentage manually.