It's easy to assume that exercise only "counts" if it's intense — a hard gym session, a long run, a punishing class. In practice, consistent, moderate movement tends to matter more for everyday wellbeing than occasional intense workouts.
Many people start with an ambitious routine, burn out within a few weeks, and stop entirely. A pattern of two or three short walks a week, sustained for months, generally has more impact on how you feel day to day than a single intense workout followed by weeks of nothing.
Movement that fits naturally into your schedule — a walk during a lunch break, biking instead of driving short distances — is far more likely to become a lasting habit than a routine that requires major disruption to your day.
As with any physical activity change, it's worth checking with a healthcare provider if you have existing health conditions or are returning to exercise after a long break.