I tend to think sports betting is more free of manipulation than the share market, so long as you use Betfair or something similar.
With the share market, it's vital to see how readily the top sells get re-filled when a SP advance is looming. Ease of movement is everything (not the indicator, the general theme). Fundies do whatever they can to inhibit free upwards price movement, so you know when they're interested in accumulating - big volumes, moderate gains and constant bot sell pressure.