Two approaches I see athletes take all the time (and did a ton myself) that inevitably lead to injury, fatigue and lost potential.
1. Combining training programs from different sources:
Common problems:
-undereating
-non-complementary choices
-peaking programs – often time-bound programs are designed for peaking, not long term development
2. Making it up on your own:
Common problems:
-weaknesses get overcooked or undercooked
-long term load management not present
-no peak, going HAM all the time, too frequent intensity
Instead, an optimal program is individualized, periodized and delegated.