22 Day Holistic Fitness & Yoga Retreat, Koh Samui, Thailand

Three weeks at Visit Natural Detox Resort is the mid-length option, and the extra week over the 15-day stay buys a second weekly Muay Thai session rather than a different programme. The weekly rhythm holds throughout: yoga Monday to Friday at 11am across Hatha, Vinyasa, Yin and Restorative under rotating teachers, strength and conditioning Monday to Friday, and one meditation workshop, one breathwork session and one ice bath each week. Twenty-one nights is long enough that the routine stops feeling like a schedule and starts feeling like a habit, which is the honest argument for this length over two weeks.

The resort sits on Koh Samui a walk from the beach, the jungle and the local markets, with rooms facing a pool garden. The open-air Wild Tribe Cafe does the social work — three weeks in a 10-to-20 person group means you will know everyone by the second Sunday.

Around 90% of guests travel solo and ages run from the early twenties to past 60, so the room is rarely cliquey. Check-in and check-out fall on Sundays. Coaches work to your level rather than a fixed standard; the practical fitness bar is walking hilly ground at normal pace for about an hour.

Watch out: Meals are not included at this tier, and neither are airport transfers — both are on you. At $1,916 for 21 nights this is the cheapest per-night rate of the four packages, but add roughly three weeks of food before comparing it against the all-inclusive.

Insider Tip: Check-ins are Sunday-only and the minimum stay is one week, so a delayed flight costs you a full week rather than a night. Land on Samui the day before and sleep near the airport if your connection is tight.

Shorter and longer versions run the same programme: the 15-day for a two-week trial, the 29-day which adds airport transfers for $2,305, and the 22-day all-inclusive at $2,963 with meals, massages and an Ang Thong day trip folded in.