CAN I TRAIN BEYOND THE LISTED PRESCRIPTION?
Yes.
However…
The periodised training model has been scaled for all fitness levels and running talent.
The "DTI and time on feet" concept offers a secure framework for advancing all levels of fitness towards their objective and level of engagement in the 
event.
That said, some people can tolerate and absorb more work. Further, running at sub-DTI can be handled by most people – AND – yes, more is better.
DTI improves aerobic capacity – the ability to uptake, absorb, and transport oxygen.
If you are ticking the following boxes, feel free to include additional DTI training sessions.
♣ You feel healthy.
♣ Zero residual niggles.
♣ Appetite control.
♣ Minimal sugar cravings.
♣ Sound sleep.
♣ You’ve been running healthy for over 5 years.
What about increasing my DTI and pressing over and above this threshold?
Again, if you feel healthy and have been running free from injury & illness for five years, increase your DTI by 5-10 (beats).
Typically I don’t support or encourage additional high-end effort sessions.
Contact Brad Pamp directly for further discussion & direction.