How to Train on Vacation

A practical plan for holding onto strength and fitness on vacation: what you actually lose, the two-session weekly minimum, and workouts needing no equipment.

Two weeks off will not destroy your training, but how you spend those two weeks decides whether you come back ready for a normal session or ready for three weeks of catching up. The goal on vacation is not progress, it is maintenance for the smallest possible time investment. That works out to about three or four hours of training across fourteen days.

What you actually lose, and how fast

The detraining data on trained people is fairly consistent, and far less dramatic than gym folklore suggests.

Strength goes slowly. Maximal strength stays essentially unchanged for the first 2–3 weeks without training; a measurable 5–10% drop usually shows up after 3–4 weeks.
Muscle mass also goes slowly. For the first 10–14 days the change is mostly water and glycogen, so the muscle looks flat without actually being gone.
Cardio fitness drops fastest. After 12–14 days with no conditioning, VO2max falls roughly 4–6%, and after a month it can be 10%.
Technique gets rusty. Your first squat and deadlift back will feel clumsier than the number on the bar says it should. That is normal and it returns within 2–3 sessions.

The practical conclusion: if the trip is shorter than 10 days, you can do nothing at all. Two weeks or longer, it is worth doing the minimum.

The minimum that holds your form

Maintaining strength and muscle takes roughly one third of your usual volume, but the intensity has to stay high. Concretely:

2 sessions per week, 25–35 minutes each.
3–6 hard sets per muscle group per week, instead of your usual 10–15.
Take sets to within 1–2 reps of failure. Easy sets done for the sake of doing them maintain nothing.
Conditioning: 2 sessions of 15–20 minutes where your heart rate goes above 140.

The no-equipment plan

This runs in a hotel room or on a balcony and needs about two by two metres. Two sessions a week, at least 48 hours apart. Rest 60–90 seconds between sets.

Session A: upper body

Push-ups, 4 sets to within two reps of failure. If you go past 25, put your feet on the bed or take 4 seconds to lower.
Pull-ups, 4 sets of 5–10. No bar? Inverted rows under a solid table, 4 sets of 10–15.
Pike push-ups (hips high, head toward the floor), 3 sets of 8–12, for shoulders.
Hollow hold 3 times 30 seconds, side plank 2 times 30 seconds per side.

Session B: legs

Bulgarian split squat with the rear foot on a chair, 4 sets of 10–15 per leg.
Single-leg Romanian deadlift with no load, 3 seconds down, 3 sets of 12 per leg.
Single-leg glute bridge, 3 sets of 10–12 per leg.
Single-leg calf raise, 3 sets of 15–20.

The whole thing takes 25–30 minutes, less time than waiting for breakfast.

If the hotel has a gym

Most hotel gyms have dumbbells up to 20–25 kg, one cable stack and a treadmill. That is enough for a full-body session twice a week, about 35 minutes:

Goblet squat, 3 sets of 10–12
Dumbbell bench or floor press, 3 sets of 8–12
Single-arm row, 3 sets of 10–12 per arm
Overhead press, 3 sets of 8–10
Dumbbell Romanian deadlift, 3 sets of 10–12

Do not chase personal records on unfamiliar equipment, with someone else's loading increments, without your normal warm-up. That is where most vacation injuries come from.

Swimming, walking and everything else

It all counts, just be honest about how much. Easy swimming for 30–45 minutes is solid conditioning and will hold your VO2max, but it does almost nothing for leg strength. A day with 12–15 thousand steps, a hike, or two hours of beach volleyball can replace one conditioning session. None of it replaces resistance training.

Food and drink

Protein: aim for 1.6 g per kilogram of bodyweight, with 1.2 g as the hard floor. At 80 kg that is about 130 g a day, which is doable even at a buffet: eggs in the morning, fish or meat at two meals, yoghurt or cheese as a snack.
Alcohol: three or more drinks in an evening measurably hurts sleep and protein synthesis for the next 24 hours. If you are drinking, do not schedule a session for the next morning.
Fluid and salt: at 30 degrees and above, count on 300–500 ml of fluid per hour spent active outdoors, and do not avoid salt.
The scale: being up 1–2 kg after ten days is almost always water, salt and glycogen. It clears in 4–7 days of normal eating.

When to see a doctor

Do not improvise if any of this shows up: chest pain, tightness, or unusual shortness of breath on exertion; fainting or heat dizziness that does not resolve within 15–20 minutes in the shade with fluids; swelling in one leg or calf pain after a long flight or drive; dark urine plus severe muscle pain 24–48 hours after an unusually hard session; any injury that stops you putting weight on a leg or raising an arm. The first three are urgent. If you have heart disease, diabetes, or take blood pressure medication, check with your doctor before doing hard conditioning in the heat.

The short version

A trip shorter than 10 days needs no training at all; you realistically lose nothing.
For two weeks or longer, 2 sessions a week of 25–35 minutes is enough, at a third of your usual volume but full intensity.
With no equipment: push-ups, pull-ups or table rows, Bulgarian split squats and glute bridges, 3–4 sets close to failure.
Conditioning fades faster than strength, so add two 15–20 minute efforts where your heart rate clears 140.
Keep protein at 1.6 g per kilogram, do not chase records on unfamiliar equipment, and ignore the scale for the first week back.