Can you limit your sleeping and sitting to just 23 and 1/2 hours per day?
That is, essentially, the question asked by Dr. Mike Evans of the University of Toronto in the following video. Exercise is the “miracle drug” that reduces the risk of dementia/alzheimers, anxiety/depression, diabetes, mortality, etc. and is great at improving quality of life! 
Cardiac Exercise Research Group
The K.G. Jebsen Center for Exercise in Medicine's blog about exercise and cardiac health
