Why Vigorous Training?
At pro play, you can technically evade one more time every 10 seconds thanks to vigor.
Which is the same cooldown as the Purity trait.
And with the evade you can evade 7 stacks of burning and 14K damage, while you can burn the whole cooldown for nothing but a cleansed cripple.
The scenario is exaggerated but demonstrates how it works.
Not to mention that the Vigor goes for 5 people, you included.
“Observe, learn and counter.”