Most people need to save more money for retirement. According to a report by Vanguard, the average American had about $141,500 saved for retirement. At the recommended annual withdrawal rate of 4%, it will only give them about $5,660 per year to live off of in retirement. 

Given those numbers, future retirees must amp up their savings rates and returns to retire comfortably. Here are the three best ways to invest for retirement to grow your nest egg to a more meaningful level.

The easiest way to invest for retirement is to buy an index fund. These exchange-traded funds (ETFs) aim to deliver returns that match the underlying stock market index, such as the S&P 500. The best index funds have low ETF expense ratios, enabling investors to keep more of their returns.

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Source Fool.com