On: Dosing.

The dose is important. If you take too little of a medicine, it is ineffective. If you take too much it will kill you.

The same stands for training, or almost any action. Too little and you will experience no benefit, too much and you will burn out. Of course, this effect tends to be cumulative, and with training, too much may not be immediately obvious.

Which is why finding your baseline, and seeking professional input is vital, particularly when starting out or attempting a specific goal.

Once you’ve set a goal, seek an expert to tune it and succeed.