After 4 years of sedentary living, start very gradually. Because you experience nausea and light-headedness/blackout after exercise, avoid running, HIIT, heavy gym workouts, and exercising alone until your doctor evaluates you. Correct your
B12 and vitamin-D deficiencies as advised.
Start:
* Week 1: 5–10 min easy walking daily + 5–10 min gentle yoga + 5 min meditation.
* Week 2: 15–20 min walking + 10 min yoga.
* Week 3: 20–30 min walking + 10–15 min yoga.
* Week 4: 30 min walking, 5–6 days/week.
Hydrate, avoid exercising fasting, warm up and cool down. Stop and seek urgent care for chest pain, severe breathlessness, fainting, or significant palpitations.