Re: "One form of exercise a day"
I'm currently watching "How to Command a Nuclear Submarine" on Netflix - it follows 5 Captains-in-training as they go through the RN training programme prior to taking on their own command.
The single biggest reason for these trainees failing to complete their objectives is 'command paralysis through overload of data' - they are faced with so much information that they need to be able to distill and decide very quickly, and many are not up to the job.
A good leader is able to make a call based on consideration of the right factors, INCLUDING time. Sometimes this means making a judgement call in absence of data, or when overloaded with data; it may not be a perfect decision, but it needs to be made NOW.