You set your investments with a plan: a mix of stocks and bonds and cash that matched your goals and your stomach for risk. But markets move, and as they do, that careful mix drifts. A strong run in stocks can leave you holding far more risk than you intended — right up until the moment the market reminds you why balance mattered.
Mid-year is when you look under the hood. Has your mix wandered from the targets you set? If so, rebalancing — trimming what's grown oversized and topping up what's lagged — brings you back to the risk level you actually chose. It feels backwards (sell winners, buy laggards?), but that's exactly the discipline that keeps a plan from quietly becoming a gamble.
You don't need to touch anything daily. You just need to check that the plan still looks like the plan — and nudge it back if it doesn't.