My philosophy of training is aptly delineated by US conditioning coach Vernon Gambetta:

„Training is not about the hurt or pain; it is not about pushing and being at the max in each workout.
That is not training. Training is systematic, sequential and progressive;
it incorporates hard workouts and easy workouts to allow the body to adapt.
Work is easy training is hard. Anyone can do mindless work that wears out the body;
not very many can focus and put the pieces together to systematically improve performance over time.
To understand what good training is, it is important to be able to separate fact from fiction and style and marketing claims from programs that have substance and produce consistent results.
Along the same line of thought beware of false prophets bearing gifts.
Nothing easily attained is ever worthwhile and nothing worthwhile is easily attained.
Focus on fundamentals and build on the basics.
Good training is built upon scientific laws, empirical evidence and best practices that has stood the test of time. Adaptation takes time;
the process is predictable based on the demands imposed on the body.
Nothing exotic here, it is all very basic, if someone tells you otherwise, don’t listen.
Take your time and stay on the functional path to the destination – optimum performance in the competitive arena.“

[Vernon Gambetta, currently Director of Gambetta Sports Training Systems,
former conditioning coach for several teams in Major League Soccer as well as conditioning consultant to the US Men’s World Cup Soccer team,
former Director of Conditioning for Chicago White Sox and Director of Athletic Development for New York Mets,
recognized internationally as an expert in training and conditioning for sport]