Getting Back Into Exercise in January: An 8-Week Plan

On January 2, you're fired up and your sneakers are fresh out of the box. The trap is trying to make up for months of rest in two weeks: five workouts, paces that are too fast, soreness that lingers, and motivation gone by mid-February.

A realistic plan does the opposite. It starts lower than you think you can handle, builds up in steps over 6 to 8 weeks, and keeps rest days in the schedule. Here are the official benchmarks, the point where you should get medical advice, and a week-by-week plan for running, cycling, swimming or triathlon.

What the official guidelines really ask for

The texts are worded differently from country to country, but they point in the same direction.

• United States: adults should get 150 to 300 minutes per week of moderate-intensity activity, or 75 to 150 minutes of vigorous-intensity activity, or a mix of both. The guidelines also recommend muscle-strengthening work (dumbbells, push-ups) at least 2 days a week (ODPHP, 2018).
• France: Santé publique France translates the WHO recommendations into "at least 30 minutes of dynamic physical activity per day," plus muscle-strengthening work twice a week or more. The French national health insurance (Assurance Maladie) asks for gradual activity, adapted to your abilities, at least 5 days out of 7.

Put together, 30 minutes on 5 days makes 150 minutes: the low end of the US range. The two benchmarks meet in the middle.

These numbers are targets for the end of your plan. On the day you restart, 60 minutes in a week is better than zero, and that's exactly where you start.

Before you start: when to get medical advice

The European Society of Cardiology (ESC, 2020) separates two situations.

• Low intensity: a sedentary person can start without any extra evaluation.
• High intensity (and some cases of moderate intensity): sedentary people or those at high risk should have a physical exam, an electrocardiogram and an exercise stress test.

For people who are already active with low or moderate cardiovascular risk, the ESC sets no restriction. Its starting assessment begins with a self-check of symptoms and a risk score (the SCORE score), which your doctor can calculate.

In practice: keep the first four weeks at low intensity. If you later want to add intervals (short fast efforts broken up by recovery) or aim for a race, see a doctor first.

What does a break cost you?

Research on detraining distinguishes "short term" breaks of up to 4 weeks from "long term" breaks beyond that. In trained endurance athletes, a 2023 review reports that citrate synthase activity, an enzyme your muscles use to process oxygen, dropped from 10.0 to 7.7 in 3 weeks without training.

That figure comes from experienced athletes. It doesn't tell you how much you lost after your holidays. The main takeaway: your body adapts quickly to stopping, and it also adapts quickly to starting again. So restart well below the level you had before the break, even if you remember it clearly.

The 8-week plan

This plan is coach-built: no study proves a standard progression. Only the weekly benchmarks above come from official guidelines.

The principle: 3 easy workouts per week, then 4, a lighter week every four weeks, and 2 strength sessions of 15 minutes each week. Intensity stays low to moderate: you should be able to hold a conversation.

You reach the low end of the 150-minute range in week 7. If you need more time, repeat a week: the plan can run 10 weeks without any problem.

For strength work, bodyweight moves are enough: squats, knee push-ups or wall push-ups, and planks. Put them on a day without an easy workout, or after a short session.

To set your pace or heart rate at low intensity, this calculator gives you your zones.

Adapting the plan to your sport

The durations in the table apply to every sport. What changes is how you fill the minutes.

• Running: alternate 1 minute of jogging with 2 minutes of walking, then add a minute to the jog in each session. Once you can jog 20 minutes straight, move on to a progression plan built on 3 runs a week or aim for a 10K in 8 weeks.
• Cycling: ride on flat terrain at a relaxed cadence, without chasing hills or speed. Add time in 5-minute steps.
• Swimming: split the session into lengths with 20 to 30 second rests. Eight short, well-swum sets beat one long set that leaves you gasping.
• Triathlon: spread your 3 or 4 workouts across the three sports, one each, and keep the fourth for the discipline you need most. The beginner triathlon guide: three workouts a week explains this split in detail.

What you can do before your next workout

• ✓Block your 3 time slots for the week in your calendar, with a set start time.
• ✓Schedule a first 20-minute workout at low intensity, whatever your sport.

Then a few simple rules:

1. Keep a rest day between easy workouts at the start, and never make up for a missed workout by doubling the next one.
2. Write one sentence about how you felt after each workout: tired, heavy legs, enjoyment. That tells you whether you can step up.
3. Move outside your workouts too: the French national health insurance (Assurance Maladie) advises keeping sitting time under 7 hours a day and breaking up sitting periods with 5 to 10 minute breaks every 2 hours.
4. Keep the same time slot every week: a habit sticks better to a fixed time than to a good intention.

If you wear a watch, KILYO reads your workouts (Garmin, Apple Watch, Coros, Polar, Suunto, Strava) and compares volume, consistency, pace and heart rate from one week to the next. It spots whether you're progressing faster than planned or skipping workouts, and adjusts your plan accordingly.

In February, two signals matter. Pain that returns after every session or lasts several days: talk to a doctor. A missed week: go back to the previous week of the plan, without guilt.

Written with the help of AI.