Apart from the tips above, I recommend to re-read Pavel's work. This passage from Seneca's letter caught my eye today:
You must linger among a limited number of master thinkers, and digest their works, if you would derive ideas which shall win firm hold in your mind...
...since you cannot read all the books which you may possess, it is enough to possess only as many books as you can read. “But,” you reply, “I wish to dip first into one book and then into another.” I tell you that it is the sign of an overnice appetite to toy with many dishes; for when they are manifold and varied, they cloy but do not nourish. So you should always read standard authors; and when you crave a change, fall back upon those whom you read before... after you have run over many thoughts, select one to be thoroughly digested that day. This is my own custom; from the many things which I have read, I claim some one part for myself.
Applies to exercise as well, right?