To-do lists as long as your arm. Days as short as a chocolate finger. We know: there are plenty of reasons for swerving a sweat session in favour of the sofa. But those NHS-recommended 150 minutes of moderate activity a week (plus strengthening exercises at least twice weekly) won’t just give you better-fitting jeans. Exercise can help reduce the risk of heart disease, stroke and diabetes, may help improve your mental health and could even rev up your sex life. Mojo still meandering? Our insider tips will help you get into the fitness groove.