Hey Aztec,
In my opinion this is the best question anyone has asked on this forum in past few weeks. Excellent.
Here’s my take for whatever it may be worth: Few people seem to understand how to take rest days. Many people seem to understand how to take “hard” training days. I think the same approach needs to be applied to both.
In my opinion a rest day is an opportunity for the body to recover and assimilate, or more correctly, adapt to the greater work load exerted by endurance training. So, with that in mind, it seems logical to take proactive measures to facilitate recovery. These include: Adequate, restful sleep in an appropriate environment. The multi-time World Formula 1 Champion Ayrton Senna was so obsessive about his recovery he demanded his head be facing south when he slept and his sheets, blankets, pillows, etc were specifically configured. While these seems odd, I have to agree. My pillows, sheets and even my bed are all new and sleeping on clean sheets prevents the spread of the common cold.
Additionally, food and hydration are key on rest days. Avoiding simple sugars and excessive stimulants is appropriate on rest days. During the week when I am training I am perpetually wired on coffee and Red Bull. When I take a rest day my diet is almost always “cleaner” with more fiber, less refined foods and sugars and more liquids.
Massage is another must-do in my opinion to facilitate adequate recovery AND adaptation. It is important your massage therapist knows what you are doing to. I don’t what my massage therapist talkiing to me. I just want them to work on me. The hour or two on the massage table is a chance for your mind to rest also. Conversation is a distraction from rest.
Also, resting your mind on a rest day is critically important. Avoid stressful situations, people you don’t like or who are abrasive and require a lot of emotional energy to deal with. This is draining. I think it is a good day to watch a light, entertaining movie, read a book, or use music to allow your brain to “change channels” from endurance sports to something else for a while.
I think it is important to really rest on a rest day also- for me, that mans no activity. I lay on the couch with my cats and watch the History Channel. I sleep in. I don’t talk on the phone. In general, I am disconnected from stuff that bugs me or may create stress.
Done correctly, a rest day really recharges your batteries so when you go back to training you are really ready to attack it.