If you look at the returns your stocks and exchange-traded funds (ETFs) have produced over the past year or so, you may be inclined to think your retirement savings portfolio is in trouble. But it is important not to dwell on the current volatility or even check your balances very often because the fluctuations are short-term, and they will pass.

That said, these types of markets are not a bad time to revisit your retirement investment strategy to make sure it is still on track to meet your goals. With growth stocks and ETFs down so sharply, it might be worth considering picking up some growth-oriented investments at lower valuations to supercharge your portfolio when the market turns. Here are two growth ETFs with lower valuations, slightly less risk, and robust growth potential.

The Invesco S&P MidCap Momentum ETF (NYSEMKT: XMMO) is an overlooked gem among ETFs. It tracks the S&P Midcap 400 Momentum Index, which is made up of approximately 80 mid-cap stocks that have the highest momentum scores or upward price movements as compared to other stocks within the larger S&P Midcap 400 Index. It is rebalanced twice a year, in March and September. They are weighted by their momentum score and market cap.

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Source Fool.com