A great article answering the topic of burn out and the importance of easy/recovery work outs.
"One of the biggest reasons people don’t train day after day is because they are tired. But they are usually tired from going too hard. I like to think that if you can keep the training reasonable, in terms of effort, you’ll be more successful in getting out the door more frequently and this will lead to less burnout syndrome. One of the most important aspects of training that I apply to beginner age groupers, to elite age groupers, to pro’s that I coach is the concept of hard day, easy day. Every athlete, at every level needs a break from training either in a recovery-type day or a complete day off. The recovery days help stimulate improvement from the hard days. Training super hard and resting for days on end will only get you so far, but I’m a strong believer in easy long swims, and easy bike rides on recovery days. You can’t go wrong with either of those.
To follow up on the point of the rest day, in my opinion, you should take rest days. These will leave you rejuvenated each week and allow you to look forward to your ‘rest’ days. These are important as well – as your body needs a break from the training, as well as your mind does too.
Even when you are training at the right intensity, every couple of weeks, your body will need a ‘rest’ or ‘recovery’ week." http://www.beginnertriathlete.com/cms/article-detail.asp?articleid=1873
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