Are bicycles at Walmart good enough quality for beginners?

Hi I want to start riding bicycles for exercise purposes but I am very short on money right now. I was thinking about riding at the recreational park bike trails. There seems to be really cheap bike like walmart and really expensive ones for enthusiast. Whats the real difference effect on biking ? I know expensive... show more Hi I want to start riding bicycles for exercise purposes but I am very short on money right now. I was thinking about riding at the recreational park bike trails. There seems to be really cheap bike like walmart and really expensive ones for enthusiast. Whats the real difference effect on biking ? I know expensive one are better quality but in what sense are they better ? Also what type of bicycle is the most versatile ? that can go on smooth and rough. I am hoping to spend around 100 dollars. Thanks in advance
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