When translating, you can’t put too much energy into it (you’ll burn out) or too little (you’ll be unengaged and bored).
Your energy level has to maintain a flight of Daedalus: not too high for the sun to melt the wax holding the feathers of the wings, not too low to get the wings drenched by the spray of the waves.
If you want to make it to shore, you have to maintain the right elevation to the end.