Training after COVID: how to come back without setting yourself back

COVID rarely costs you just one week of training. Even a mild infection leaves you with a higher resting heart rate, worse sleep, and the feeling that the same barbell got heavier while you were away. Here is a concrete return plan with actual numbers, instead of the usual advice to listen to your body.

When you are actually cleared to start

Three conditions have to be met before the first session:

• No fever for at least 3 days, without taking anything that lowers it.
• You can walk 500 metres on flat ground and climb two flights of stairs without stopping and without heavy breathing.
• No chest pain, no palpitations, no dizziness, either at rest or while walking.

If the infection was mild and stayed above the neck (no chest tightness, no full-body muscle aches, no fever over 38 °C), most people can start easy 7 to 10 days after the first symptom. If you were flat on your back with a fever over 38 °C for more than three days, plan on 2 to 3 weeks before you touch a loaded bar.

First test: resting heart rate

Take your pulse in the morning, before you get out of bed, seven days in a row. If your average is more than 8 to 10 beats higher than your normal from before the illness, your body is still recovering and that day is a walking day. Once it settles back to within about five beats of normal, move on to the next phase. It is the cheapest and most reliable signal you have.

The week-by-week ramp

Week 1: movement only

Walk 20 to 30 minutes a day at a pace where you can talk in full sentences. No running, no weights. If that walk puts you on the couch for the rest of the day, you stay in this phase another week.

Week 2: light strength work

Two full-body sessions, 5 exercises each, 2 sets of 10 to 12 reps at roughly 50 percent of the weight you were lifting before you got sick. End every set with at least 4 to 5 reps left in the tank. Keep the whole session under 40 minutes including the warm-up.

Weeks 3 and 4: seventy percent

Three sessions a week, 3 sets of 8 to 10 reps at 65 to 70 percent of your old loads, still leaving 3 reps in reserve. Add 20 minutes of cycling or brisk walking at up to about 70 percent of max heart rate (rough estimate: 220 minus your age, times 0.7).

Weeks 5 and 6: back to normal

Return to your usual set count and aim for 85 to 90 percent of your old loads. Only after two consecutive weeks with no energy crash the next day should you go back to sets to failure, sprints and heavy singles.

Total: 4 to 6 weeks for a mild case, 8 to 12 if it hit you hard. None of that is wasted time, because strength comes back far faster than it was built the first time.

Signs you pushed too hard

• Fatigue that shows up 12 to 48 hours after a session and lasts more than a day.
• Resting heart rate 10 or more beats higher the morning after training.
• Getting winded at a workload that used to feel easy.
• Headaches, brain fog, or 8 hours of sleep that leaves you just as tired.

The response is always the same: take two days off, then drop back to the previous phase and stay there another seven days. That is not going backwards, it is the only way to avoid spending two months going in circles.

A practical rule: if you could not repeat the same session two hours later, it was too hard for the phase you are in.

Sleep, food and fluids

Recovery needs 7.5 to 9 hours of sleep, and that matters more than any extra training session. Protein goes to 1.6 to 2.2 grams per kilogram of body weight per day, which is roughly 130 to 175 grams for an 80 kg person, split across 3 to 4 meals. Do not run a calorie deficit deeper than 300 to 400 kcal a day during this period; if you want to lose weight, wait until the return is finished. Fluids: about 30 to 35 ml per kilogram, so 2.4 to 2.8 litres at 80 kg, more if you still have a fever or you sweat at night.

When to see a doctor

Do not try to solve any of the following with a training plan:

• Chest pain, pressure or tightness, whether on exertion or at rest.
• Palpitations or skipped beats, or a resting pulse over 100 for more than a few days.
• Fainting, blacking out, or dizziness on standing up.
• Breathlessness while walking on flat ground, or swelling in the legs.
• Symptoms lasting longer than 12 weeks, or that reliably get worse after even light exertion.

Chest pain and loss of consciousness mean emergency care now, not an appointment next week. The rest is a conversation with your GP, who may want an ECG, blood work, or a cardiology referral before you go back to hard training.

The short version

• Start only when you have been fever-free for 3 days and can do two flights of stairs without getting winded.
• For the first two weeks lift about 50 percent of your old loads, 2 sets of 10 to 12, with 4 to 5 reps left in reserve.
• A morning resting heart rate 10 beats above normal means that day is a walking day.
• The full return takes 4 to 6 weeks for a mild case and 8 to 12 for a bad one; sets to failure come last.
• Chest pain, palpitations, fainting or symptoms past 12 weeks go to a doctor, not to the gym.