Slowman wrote:
...and you watch something on a screen...
1. what do you do differently, position-wise, on your tri bike indoors verses outdoors?
2. how LARGE is the screen, and where is it, relative to you? straight ahead of you? angled down? to the side? on the ceiling?
1. you loose all the equilibrium feel, with several consequences :
you do not work the muscles contributing to balance, both on a muscular point of view AND neuromuscular reflex
you do not learn how to operate the bike swiftly and relaxed on the road, while in this position
...
Then, when on a real road, like Lionel Sanders, you look like shit on the bike, you are not relaxed and easy, and when something happen in front of you on the road (pot hole, cat, dog, triathlete who trained too much on Swift, ...), you crash like a wingless turkey... seen Chicken Run ?
https://www.youtube.com/watch?v=jVdlxwX6A7g Pink ? Well, depend on the proportion of time you really spend practicing the position on the road.