Why the same workout every day can stall your fitness

Keeping consistent is fundamental if you want to get in shape - you simply won’t improve your fitness if you never put the effort in at the gym.

That said, some influencers argue there’s an upside to repeating the exact same session "day-in, day-out", even claiming that doing an identical workout for years has been central to their fitness results.

It’s an attractive idea for anyone who finds routines hard to stick to. But if your body stops being challenged, repeating the same workout can eventually undermine the very goal you’re working towards.

Homeostasis, exercise stress and fatigue

To make progress, you need to upset your body’s homeostasis - the mechanism living organisms use to keep internal conditions stable even when the outside environment changes.

In an exercise context, an external change might be lifting weights in the gym. That training stress shifts your internal environment, which in turn disrupts homeostasis.

That disruption is what drives the body to respond and adapt. When exercise is the stressor, one key response is fatigue, because your usual internal state has been disturbed.

As training places greater stress on the body, it produces more fatigue. Only when the stress is reduced - for instance, by taking a rest day between workouts - can that fatigue begin to fade.

Fatigue is, in many ways, the gateway to physical adaptation. More fatigue generally means more potential to adapt, and therefore a better chance of improving fitness. By contrast, if your training doesn’t meaningfully disturb homeostasis, you won’t accumulate enough fatigue to trigger noticeable physical change.

However, there’s a limit: pushing fatigue too far can harm performance and raise the risk of illness.

When adaptation happens, the body effectively adjusts its homeostatic "set point". In practical terms, the minimum level of stress required to provoke a fatigue response becomes higher.

"Progressive overload" for workouts

Because that threshold rises, ongoing improvement requires you to alter training so it continues to create sufficient stress and fatigue. This concept is known as "progressive overload".

Broadly, progressive overload can be achieved in three ways:

• increasing the intensity of the exercise
• increasing the frequency of training sessions
• increasing the duration of each workout

Biological adaptation is a complicated blend of these factors, although intensity is generally viewed as the main driver.

To raise intensity, you can either make the exercise itself more demanding or adjust recovery - for example, by reducing recovery time between workouts.

It’s worth remembering that adaptations occur during recovery, not during the workout itself. So if you do increase intensity, it can be sensible to keep sessions shorter overall to reduce the risk of exhaustion.

It also matters how quickly you progress. Your workouts don’t need to get harder every single time. Depending on your current fitness, you may only need to increase intensity once every 4-8 weeks.

One further caution: doing only high-intensity work isn’t a complete solution for better fitness and health. A blend of low-, moderate- and higher-intensity exercise is needed to encourage a broader range of physiological adaptations.

Consistent workouts

So what if you kept the same routine "day-in, day-out"?

You’d likely experience an initial phase of improvement because your body is adapting to a new challenge. But without progressive overload, those gains can only be maintained at best. In some cases, fitness can even slip over time, eventually returning you to where you began.

There are psychological advantages to a more progressive style of training too. Many people stop exercising for personal or environmental reasons - including reduced motivation when workouts become boring or no longer feel enjoyable.

Adding new movements, or simply introducing variety within familiar sessions, can help you stay engaged and keep enjoying your training.

Although repeating the same workout can look like the simplest way to remain active, it may work against you over the long term.

If you want to stay fit, adjust your workouts every 4-6 weeks (either by boosting intensity or changing the exercises), include a range of activities (such as weight training and cardio), and monitor your fitness so you can recognise when it’s time to change your workout again.

Dan Gordon, Professor of Exercise Physiology, Anglia Ruskin University; Jonathan Melville, PhD Candidate, Sport and Exercise Science, Anglia Ruskin University, and Ruby Cain, PhD Candidate, Anglia Ruskin University

This article is republished from The Conversation under a Creative Commons licence. Read the original article.