Patients are tired of being told to 'just exercise more'. So am I. The advice is right but uselessly vague. Let me give it to you the way I give it in clinic.

For mild-to-moderate depression, structured aerobic exercise produces effect sizes comparable to first-line antidepressants, with the further benefit of cardiovascular and metabolic gains. For anxiety, the effect is slightly smaller but reliable. The mechanism isn't only endorphins — it's BDNF, vagal tone, sleep architecture and a felt sense of agency.

150 minutes a week of moderate aerobic work (you can hold a conversation but not sing) — split across 4–5 sessions, not two long ones. Add two short resistance sessions. The form barely matters: brisk walking, swimming, cycling, dancing. What matters is consistency over six weeks, because that's roughly how long the brain takes to register the new baseline.

Depression makes the start almost impossible. So shrink the start. Five minutes outside, same time daily, for one week. Add five minutes a week. Track it on paper, not on the phone. By week six you will be at 30–40 minutes and the mood lift will be measurable.

If you've tried and nothing has worked, take the PHQ-9 here — there may be a layer underneath that needs clinical work first.