SPY has been rebounding from the Dec sell off and looks to be getting tired. The rebound has lately increased in acceleration several times detailed here on a 15 min chart:
Shallowest uptend drawn with orange support line, next with green, and latest steep uptend (which has just broken) is in red. Short on the red trendline break (which has already happened). 1st downside target at the green support line (falling back to previous uptrend). Next downside target falling back to the orange support line. I like the orange trendline target as it also coincides with moving average support.