I’m writing this from Brač, an island off the Croatian coast, about halfway through a month here. I do a trip like this most summers, often an island, often somewhere out in the middle of nowhere, and it almost always means the same trade off. I can run exactly like I would at home, but strength training gets stripped right back to whatever’s actually possible.

Right now that’s a couple of basic calisthenics sessions a week, done wherever there’s space, my accommodation, a patch of shade in the olive groves I run through most mornings. If I stumble across an actual gym somewhere on my travels I’ll go once or twice while I’m nearby and get a full body session in. Otherwise it’s push ups, pull ups if I can find a bar, some core work, and that’s about it for weeks at a time.

I don’t stress about this, and I want to explain why, because I think a lot of people in my position would quietly be panicking, assuming every week without “real” training is a week of progress unravelling. It isn’t, and there’s decent research behind why not.

How fast do you actually lose fitness

The first thing worth knowing is that some of what feels like early muscle loss isn’t muscle loss at all. When you cut back on training, your muscles lose glycogen, and the water that comes with it, which makes them look and feel smaller within days. Older research sometimes mistook this for real tissue loss, but studies using more precise body composition methods have found that what looked like lost lean mass was actually just lost water, no muscle tissue gone at all.

Actual, measurable declines in muscle size and strength take longer to show up than people assume. One study followed adolescent athletes through three full weeks of total training cessation and found no significant drop in muscle thickness, strength, or sport performance. Other research broadly supports the idea that you hold onto muscle fairly well for about a month with no training at all, and I’m not even doing that. I’m still running most days and doing some strength work, just far less of it and far less structured than normal.

Why a couple of sessions a week is enough

This surprised me when I first looked into it properly. You don’t need much to maintain what you’ve built, even though you needed a lot to build it in the first place. Research on maintenance training points to something like one or two intentional, reasonably hard sessions a week being enough to meaningfully protect against muscle and strength loss, even through big disruptions to normal routine, travel included.

Building strength requires consistent, progressive effort over time. Keeping it requires far less. That gap is the whole reason a trip like this doesn’t worry me. I’m not trying to progress right now, I’m trying to hold the line, and holding the line is a much lower bar.

It helps that I’m not new to this either. I’ve spent decades building the strength and muscle I currently have, and that history counts for something. The body doesn’t treat a well established base the same way it treats something recently and precariously gained, which is a big part of why I don’t feel the need to hunt down a gym every few days, even though I’m older now and could reasonably be more anxious about this than I was in my twenties.

Whatever I lose, I’ll get it back faster than I lost it

There’s also solid evidence that strength lost during a break returns faster than it disappeared. In one study a group trained for 24 weeks, detrained for 24 weeks, then retrained for just 12 weeks, and fully regained the strength they’d lost. In another, a group trained for seven weeks, detrained for seven, then retrained for seven, and came out the other side stronger and more muscular than after their original training block. It took them well under seven weeks to recover what a seven week break had cost.

So even in the worst case, even if I come home from this trip having genuinely lost some strength, I know from the research, and from having done this most summers, that I’ll have it back within a couple of weeks of consistent training. It’s never taken longer than that for me.

The bit people miss, the downtime is doing something useful

Most people who talk themselves out of panicking about time off frame it as damage limitation, you won’t lose that much. I think there’s a better case to be made. The downtime is actively useful, not just harmless.

Tendons and ligaments adapt far more slowly than muscle, and they’re also the slowest tissue to recover from accumulated training stress. Training hard, continuously, without a break increases the risk of overuse injuries, tendinopathies, joint irritation, the kind of nagging issue that doesn’t come from one bad session but builds up over months of never backing off. A stretch like this, where my strength training drops right down while I keep running, gives those tissues real recovery time that they don’t get when I’m training normally at home. There’s a controlled trial comparing continuous resistance training against a program with built in deload weeks every four weeks, and it found no difference in strength or muscle growth between the two, the deloads cost nothing in terms of progress, while almost certainly delivering recovery benefits the continuous group didn’t get.

I think of this whole trip a bit differently because of that. It isn’t a month of losing ground. It’s closer to a planned deload with some very good running attached.

What I’m actually doing right now

To be clear, this isn’t a month of doing nothing.

Running exactly as I would at home, I’m still marathon training, and the running here, through olive plantations most mornings, has been some of the best of the year.

Calisthenics a few times a week, nothing structured or heavy, just enough to keep the pattern of strength work in place.

A full gym session or two, opportunistically, whenever I come across a proper gym on my travels.

Eating well and staying generally active day to day, which matters more than people give it credit for.

That’s the minimum effective dose in practice. It’s not zero, and it’s nowhere near what I’d do at home, but it doesn’t need to be, because maintaining and building are two different jobs that need two very different amounts of work.

Consistency over completeness

None of this is an argument for training less than you need to when you’re actually trying to progress. It’s an argument against the anxiety, the idea that missing your normal routine for a few weeks quietly costs you months. If you train hard and consistently for the large majority of the year, a month like this one isn’t a setback. It’s part of a sustainable pattern, and if anything it’s giving my joints and tendons recovery time they wouldn’t otherwise get.

I’ll go home in a couple of weeks, get back in the gym properly, and within a fortnight I’ll be exactly where I left off. That’s not a guess, it’s what’s happened every summer I’ve done this, and it’s what the research says should happen too.