You might surprise yourself!
I’m sure there is some deep psychology behind this…
When I row in the morning I keep an eye on my average time for 500 metres and calculate how many metres I will do in 30 minutes.
When I don’t bother putting my glasses on and just row, without exception I row further.
I’m being limited but what I’m seeing, what I think I can do, and what I’ve always done, this is the same for everything in life, sometimes we need to not think too much and just get on with it. You might surprise yourself!