Health is a heavily researched and reported on topic. It is one that constantly brings us new fads, and advice that goes contrary to common accepted beliefs. I think it is great that we have access to these new studies, but it is important to understand other contributing factors that can skew some data. I think it is wise to not jump into any new program before fully researching the benefits and costs, and most importantly deciding if it is something that works for you.
We are all built differently and certain programs may be easier for others and may only give positive effects to others. I have found that balance works best for me. I think variety is good in keeping us motivated and fresh, while also allowing the body to heal. In the past I did not believe in rest days. However, after getting sick frequently in the year I worked out the most, I knew I had to change. By working out less, I was more excited for a workout, and my body felt so much better not having constant aches and pains. I do not believe anyone can go off a strict weekly plan whether it be in terms of miles, reps, or hours.
The human body has an advanced nervous system that relays information to us constantly. We do not need heart rate monitors, or gps watches, we just need to listen to what our body is telling us and adjust accordingly.