Exercise in a Pill?

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Ultimately the research may reach a point where it will be possible to take a pill that provides you with all the beneficial effects of physical activity without getting off the couch, but will this occur in our lifetime? It's unlikely.

Finally when we are physically active both our body and our environment benefit when we walk to a destination rather than drive we reduce our carbon footprint; will an exercise pill be able to give the environment a benefit as well as our body?