I tried training in the web app for the first time yesterday. There is a lot of clicking involved. Training with three bars simply burns twice the stamina for twice the gain. I don't see it as being any different from training twice with two bars (or in terms of the phone app, doing the "practice match" twice). The only way training with three bars would be beneficial is if the risk of injury is LESS than twice as high as trainign with two bars.
3 bars training is quicker than 2 bars (phone default) training twice, since each kind if session always takes 6 seconds.
AH AH — manager of Atlético Kolkata. Named in honour of my hometown club, Atlético de Kolkata, which won the inaugural edition of Indian Super League in 2014.