I have never advocated marathon races for several reasons. The first reason is that they usually occur on Sunday, cause traffic jams, and have prevented me from attending church. The second reason is that preparation for such marathons almost becomes a religion in itself. Anyway, I was very glad to hear of this new research presented by Dr. Mercola.
A safer and more effective exercise is high intensity interval training (HIIT), which consists of short bursts of intense exertion; HIIT maximizes the benefits for your heart, and optimizes your HGH and insulin levels.
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