Most walking holidays quote you a single grade — "moderate", usually — as if a whole week could be summed up in one word. A week at Casa Agara doesn't work like that, and pretending it does would only set someone up for a bad morning on a steep track. The honest answer to "how fit do I need to be?" is: fit enough for the day you choose. And you get to choose.

There is no single fitness test — because there is no single walk

The house sits in one spot in the Cabuérniga valley, and you walk out from it each day rather than following one fixed itinerary from A to B. That's the whole point, and it's what makes the fitness question hard to answer in one line. Some days are genuinely gentle. Some days are hard work. The week bends around who is here and what they're up for, not the other way round.

The walking is run by Walkwise, who know these hills properly and know the difference between a route that looks fine on a map and one that punishes your knees on the way down. That matters more than any grade in a brochure.

What do the gentle days actually feel like?

Gentle here means gentle. The coastal path near San Vicente de la Barquera is around 11 km, largely flat, with boardwalk stretches and the sea beside you the whole way — you'd struggle to get lost or worn out on it. Closer to home, the low-valley forest routes near Ucieda stay under 600 m, following rivers through oak and beech shade at whatever pace suits you. A comfortable two hours to a village with a bar, then back. If everyday life keeps you reasonably mobile — a decent walk into town, a flight of stairs without drama — you can manage these comfortably.

And the hard days? Honestly, they are hard

The high ground doesn't get talked down. Routes up to the Puertos de Sejos climb well over 1,000 m, with real ascent, loose stone and exposed stretches where the weather has opinions. On days like that, conversation stops and breathing takes over. They're wonderful, and they are not "moderate" — they ask for proper hill fitness and knees that don't mind a long descent. We'd rather tell you that now than have you find out on a switchback two hours from the house.

A realistic gauge, for what it's worth: if you can comfortably manage a brisk two-to-three-hour hill walk at home — real ascent, not a flat park loop — with a light pack on your back, you're in reasonable shape for these days. If your idea of a long walk is a flat towpath, start the week on the gentle routes and build up as the days go on. Fitness for hill walking is specific to hill walking; a couple of days on the lower valley paths here will sharpen it faster than months of treadmill sessions at home.

Can a mixed-ability group walk together?

Up to a point, and this is where honesty beats a sales pitch. Because everyone walks from the same base, a group is rarely doing exactly the same thing — some head high while others take the river path and meet back at the table. Many days genuinely do offer a softer option and a harder one. What I won't promise blind is that every single day splits neatly into a fast group and a slow group with a guide for each; that depends on the week, the group and how Walkwise are running things. If walking at your own pace without holding anyone up is the thing you're anxious about, ask when you book and they'll tell you honestly how that week is shaped.

How do I know which days are for me?

You tell Rob and María — and Walkwise — the truth about where you're at. Not the version of yourself from ten years ago; the actual current you. Dodgy knee on descents? Out of the habit of long days? First proper hills in a while? Say so. They'll point you at the days that suit and tell you plainly which ones to sit out. Nobody is marched up a mountain they didn't sign up for, and nobody's ego gets a route they can't safely enjoy.

It helps to describe recent experience rather than a fitness class or a gym membership. A spin class three times a week doesn't tell anyone much about how your knees handle a rocky descent — but a plain description of the last proper walk you did, and how you felt the next day, tells them exactly what they need to know.

Say where you're really at when you book

The best walking week is the one matched to you, and that only happens if the matching is based on real information. Drop Rob and María a line on WhatsApp (+34 699 489 998) or at hello@agara.es and describe your walking honestly — they'd far rather have that conversation before you book than watch you struggle on day two.

When you're ready, the scheduled per-person weeks are booked through Spice Escapes, Casa Agara's booking partner — ATOL protected (licence 9046) and running hosted holidays for over 45 years. There's no forced single supplement either: twin-share with a same-sex room-mate at no extra charge, or take an optional room of your own for a clearly-priced supplement. Come alone or as a couple, walk the days that fit you, and let the valley set the rest. Have a look at the weeks, or tell us your pace first.