I day trade ETF arb pairs like SQQQ/TQQQ, TVIX/SVXY, NUGT/DUST, UWT/DWT, LABD/LABU. See my recent TASC articles. Need to adjust share size based on trading ranges. biggest challenge is figuring out how to scale in/use trailing stops for variety of types of trading days, eg strong trend vs sideways chop vs midday reversals. I am 100% convinced that solving it provides a huge advantage, figuring out the details for consistency regardless of mkt condition is my #1 goal. One variant I've traded profitably is to wait til after initial move on strong-trending ORB day, eg TQQQ/SQQQ, then setting buy-stop orders .5 or so above market for each, then scaling into whichever one hits first. my biggest failure as trader this last 20 years is extreme risk avoidance, trading small size. its why im still a vendor; i trade small. ETF arbs solves this, because with the safety net of "if one goes up, the other goes down, guaranteed" I have no fear of big stop losses, since gains in one offset losses in the other. solving to get past breakeven in all mkt types is the current challenge. often in chop days oil (UWT/DWT) or gold (NUGT/DUST) works best. i haven't posted here in many years (thx Baron for #1 trading forum)... this topic is extremely worthwhile; solving it has the potential to beat the market. solving for swings is likely easier than daytrading. thoughts?