One good thing about training indoors in winter

[bikebottles]

The toilet is steps away. Aaaaaah.

No searching for that elusive place to go.

 

[Frank222]

So that thing may be useful only in severe need not in just normal. I don't thing there is any advantage of indoor exercise except the calm feeling because no one is there to watch you and you also don't watch any body..
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Cary Fitness