You're long EURUSD at 1.0850, 0.40 lots, stop 25 pips below at 1.0825: $100 at risk on a $10,000 account, the standard one percent. Forty minutes later price is at 1.0890 and your open profit is $160. This is the moment that separates traders from spectators, because you now face a question nobody asks before entry: how much of that $160 are you willing to hand back for a shot at $400?
Handle it badly in one direction and you strangle the trade: a stop yanked to 1.0885, five pips under price, gets clipped by ordinary spread and wobble, and the 100 pip runner leaves without you. Handle it badly in the other direction and you round trip: no trail at all, the pair fades back to 1.0850, and a $160 gain becomes a scratch that stings worse than a clean loss. A trailing method is a pre-written answer to the giveback question, chosen before the money is on the screen and your pulse has a vote.
Structure trails follow the market's own footprints
An uptrend, by definition, prints higher lows. A structure trail sits your stop a couple of pips beyond the most recent completed swing low and moves it up only when a new higher low forms. In the EURUSD trade, price pulls back to 1.0868 and then pushes to a fresh high: 1.0868 is now a confirmed higher low, so the stop moves from 1.0825 to 1.0865. You have locked in 15 pips ($60 at 0.40 lots), and the trade stays alive unless the structure that justified it actually breaks. This is the natural trail for trend trades. It gives back the most at the turn, and in exchange it almost never gets shaken out by routine noise.
ATR trails use measured distance instead of chart reading
Average True Range answers one question: how much does this market wiggle per bar? On a 15 minute EURUSD chart in the London session, ATR(14) might read 8 pips. A 2.5x ATR trail keeps the stop 20 pips behind the highest price reached since entry, ratcheting up as price advances, never retreating. At the 1.0890 high the stop sits at 1.0870, protecting roughly $80 of the $160. The multiple is the personality dial: 1.5x is aggressive and gets tagged by normal pullbacks, 3x hands back more but survives them. Test the multiple on your own setup's history. On most intraday trend trades, anything tighter than 2x is where trails start strangling winners.
Time stops handle the trades that go nowhere
Some trades don't lose, they loiter. A time stop closes any position that hasn't reached, say, plus 1R within 90 minutes, or within 12 bars, whatever your journal says a working trade should have done by then. The logic is information plus opportunity cost: your setup was built on a burst of momentum, and if the burst hasn't arrived, the premise is stale even though the stop is untouched. Capital parked in a loitering trade also blocks the next valid setup, and on an intraday schedule the next setup is the whole business.
Match the trail to the trade, not to your mood
Trend trades and mean reversion trades want opposite exits. A trend trade has an open-ended target, so it deserves a loose leash: structure, or 2.5x to 3x ATR. A mean reversion trade has a defined destination. You shorted an overextension expecting a return to the 20 period average, and when price gets there, the reason for the trade is finished; take the exit. Trailing a mean reversion winner past its target is how a completed idea turns into an accidental trend trade in the wrong market state. Use targets for reversion, trails for trends, time stops for both. And whichever trail you pick, write it into the plan before entry: a trail invented mid-trade is not a method, it's a negotiation with your own fear.