The S&P 500 and Dow Jones Industrial Average have hit new highs, but observers remain skeptical over how much more room there is left to run in the so-called most hated bull market, with some pointing to a flat or low-return environment ahead.

Consequently, if investors aren’t going to see a repeat of the breakneck performance of yesteryear, they may consider exchange traded funds that track buy-write or covered call strategies as a way to generate attractive yields along the way.

Goldman Sachs Chief U.S. Equity Strategist David Kostin has pointed to policy uncertainty, low economic health and decelerating corporate buybacks as key points that have reined in further gains in the equities market.

Stocks have also not performed particularly well during an election year.

Related: In Uncertain Times, Cash is King in Investing

A stronger U.S. dollar is putting a cap on large U.S. companies with an international footprint.

Laurence D. Fink, Chief Executive Officer at BlackRock, is also skeptical about stocks, pointing to the disconnect between the ongoing rally and depressed earnings. Corporate earnings have declined for five quarters in the so-called earnings recession.

“Equity market returns have leapt ahead of economic fundamentals since the financial crisis,” according to a BlackRock research note. “The S&P 500 has generated a 60% return (including dividends) from its 2007 peak. That is roughly three times the increases in U.S. nominal GDP and corporate earnings over the same period. Returns have effectively been driven by multiple expansion (Rising price-to-earnings ratios) and share buybacks, rather than earnings growth. Many non-U.S. equity markets have been running on fumes as well. This is not sustainable, in our view.”

Related: Is Your Minimum Volatility ETF a Crowded Trade?

Consequently, with the stock market rally growing long in the tooth, a buy-write or covered call strategy could be an effective investment strategy in a more sideways trending market.

There are a few covered call or buy-write ETF options available. For instance, the Powershares S&P 500 BuyWrite Portfolio (NYSEArca: PBP) is the largest buy-write ETF based off the S&P 500, and the Horizons S&P 500 Covered Call ETF (NYSEArca: HSPX) also employs a covered call strategy on the S&P 500.

The Recon Capital NASDAQ-100 Covered Call ETF (NasdaqGM: QYLD) provides a covered-call strategy that targets Nasdaq-100 securities.

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