How to start exercising

Before you start: is a health check needed?

Most healthy adults can begin light and moderate activity without an additional check; the threshold is fairly low for low-risk activity such as walking. Medical advice is needed first in the following cases: known cardiovascular disease, uncontrolled blood pressure or diabetes, a history of exercise-triggered chest pain or dizziness, pregnancy, and complete inactivity spread over many years. This list is not meant to frighten but is a precondition of a safe start; in most cases medical clearance opens the way with “you can begin, within these limits”.

Choosing an activity: enjoyment, access, suitability

There is no such thing as “the best sport”; there is the sport you will keep doing. Three questions help when choosing: which activity do you enjoy, or at least not find off-putting? Which one can you reach easily (near home, at home, in free public spaces)? Which suits your body's current condition? Walking collects the most “yes” answers to those three questions, and the guide to starting walking sets out that route in detail. For those who prefer to be at home, the equipment-free home programme is a starting point, and for those warming to the idea of a gym, the first day at the gym guide.

The principle of starting small

The most common mistake at the start is filling six days of the first week while motivation is high; by the third week fatigue and aches accumulate and the programme collapses. Do the opposite: begin with less than you could sustain. Three days a week, 15–20 minutes; that is target enough for the first weeks. Its being easy is part of the design; an easy target gets completed, a completed target builds confidence, and confidence brings regularity. The time to add volume comes after the current routine has run smoothly for a few weeks; the eventual framework for general health is in the how many days a week to exercise guide.

Habit architecture: do not lean on motivation

Motivation fluctuates; regularity is built by design. The tools that work are well known: placing exercise on particular days and times like a diary appointment, attaching it to an existing habit (“a walk before dinner”), laying out your kit the night before, and marking off each completed session somewhere. A strategy for missed days should also be decided in advance: if you miss a day, you carry on from where you left off the next day; “this week is ruined, I will start again next week” is where beginnings most often die.

Setting the goal properly: behaviour, not outcome

Most starting goals are set in terms of outcomes: a certain weight, a certain size, a certain look. The problem with outcome goals is that they are not under your control; the body's response speed varies from person to person, and the delay turns the goal into a sense of failure even for someone working hard. Behaviour goals, by contrast, are entirely in your hands: “I will walk three times this week”, “I will do strength work on Tuesday and Friday”, “I will record every session”. These goals either hold or they do not each week; there is no ambiguity, and every week that holds carries confidence into the next. Research also supports the view that process goals produce more durable behaviour change than outcome goals. The practical advice is this: do not erase your expectations about outcomes altogether, but move them into the background, and make your weekly review purely on behaviour. “What proportion of my plan did I do this week?” is a far fairer report than whatever the scales say that week.

What to watch for in the first months

Mild soreness and stiffness are the ordinary response of a body new to training, and they pass within a few days. Pain that is sharp, concentrated in one spot, steadily increasing or not relieved by rest is a warning: stop the activity and, if necessary, see a doctor or a physiotherapist. Carrying on despite pain is not determination but the shortest route to turning a small problem into a large one. Keep your expectations about progress realistic too: what changes in the first weeks is fitness, sleep and general energy before appearance. A modest programme sustained for three months is always worth more than an ambitious one sustained for three weeks.

Frequently asked questions

This guide draws on the World Health Organization's physical activity recommendations and on common clinical approaches to health screening before starting exercise.