I trade stocks and every trading day of the year there are different stocks that have different levels of movement.
You definitely need to be able to adjust to market confitions and have a strategy that are appropriate to the current volatility of the stock you are trading.
For example, for my enveloping, I'll use stocks that have lower volatility on the day, but if their volatility goes up, I'll keep them out of my enveloping routine. And I may even look to trade them from a momentum or relative strength standpoint.
Cash