No program is perfect.
All programs are flawed.
What does he mean?
Well, when it comes to exercise, strength, & conditioning: even the best, most proven, tried & tested programs need to be tweaked for the individual athlete’s particular situation at some point.
You can have an awesome program planned out, but if your client is a 17 year-old boy who just broke up with his girlfriend last night, hasn’t slept or eaten, and it mentally checked out, then it’s probably not wise to have him test a one-rep max back squat.
That’s just one hypothetical example.
As a coach you must be able to adapt any program to what serves the athlete best.
Outside of the gym, this applies to many other areas of life.
As a leader in business, for example, you must continually assess and discard what isn’t working.
If you don’t want to get left behind, that is.
Having a great program is great.
Not being completely stuck to that program is even better.
Matt Fried 