5: TRAIN WITHIN YOUR LIMITS
4: TRY TO PUSH YOURSELF FURTHER THAN BEFORE
These two guidelines may seem contradictory, but, in fact, they complement each other. The former is an admonishment to take appropriate precautions and choose a weight you can safely use with proper form for the desired minimum number of reps. The latter is a rallying cry to try to always get at least one more rep or use a little more weight than previously, for strength gains are the key to growth. Heed the precaution of number five and then drive yourself to greater gains with the fervor of number four.
3: REST TO GROW
It's one of the great truisms of bodybuilding that you grow when you’re not working out. Make sure you allow enough time for a bodypart to recover and grow before hitting it again. For the most part, that equates to 48-72 hours between training the same bodypart.
2: ALWAYS USE PROPER FORM
The most common training mistake made is simply not performing exercises correctly and thus not maximizing the stress on the targeted muscle(s). A lot of experienced bodybuilders have fallen into bad habits or never learned how to do an exercise optimally, thus limiting gains and increasing the odds of injury. Refocus on each exercise to make certain you’re getting all you can from it.
1: PERSISTENCE AND CONSISTENCY WIN OUT IN THE LONG RUN
Bodybuilding is a marathon, not a sprint. Beyond your first two years of training, progress will come more slowly. Those who make the greatest changes are the ones who steadily train for years with passion and intensity, and who maintain an enduring quest for gains in muscle via gains in wisdom.