Which exercise programme for whom? An evidence-based guide

Zone 2, HIIT, 10,000 steps, lifting weights after 60, wall sits for blood pressure: exercise advice has rarely been so loud. Yet for most people, the health gain depends less on the "optimal" protocol than on training regularly at all. This guide sorts the common approaches by their evidence and shows what matters first, for whom.

The baseline for all adults

The World Health Organization (WHO) 2020 guidelines recommend that adults do 150–300 minutes of moderate aerobic activity a week (brisk walking, for example) or 75–150 minutes of vigorous activity – or a mix – plus muscle-strengthening activities on at least two days. From 65, add varied activity that emphasises balance and strength on at least three days a week. The core message: some activity is better than none, and more is better.

If you prefer counting steps: a meta-analysis of 15 cohorts with 47,471 adults (Paluch et al., 2022) found a 53% lower risk of death in the top quarter (median 10,901 steps a day) than in the bottom quarter (3,553 steps). The benefit levelled off at around 6,000–8,000 steps in people aged 60 and over and around 8,000–10,000 in younger adults. And if weekdays are impossible: in British data on 63,591 adults, "weekend warriors" who reached the target in one or two sessions had a 30% lower risk of death than inactive people. Both are observational – associations, not proof – but consistent.

The protocols, checked

Moderate endurance training and "Zone 2"

This means easy, steady training just below the first lactate threshold – you can still hold a conversation. It is ideal for beginners. On social media, "Zone 2" is often sold as the superior method for mitochondria and longevity. A 2025 review reached a sober conclusion: the evidence does not support Zone 2 as the optimal intensity for mitochondrial capacity, and the recommendation rests largely on observations of elite endurance athletes training at very high volumes. Higher intensities are well supported, especially when time is short. We are not aware of any randomised trial comparing Zone 2 with other intensities on mortality. Good training – not a secret formula.

High-intensity interval training (HIIT) and the Norwegian 4×4

The 4×4 format from Trondheim: after a 10-minute warm-up, four 4-minute bouts at 85–95% of maximum heart rate separated by 3 minutes of easy recovery, about 40 minutes in all. In the Generation 100 trial, 1,567 people aged 70–77 were randomised for five years to twice-weekly HIIT, moderate continuous training or the usual activity advice. After five years, 3.0% of the HIIT group had died, 5.9% of the continuous-training group and 4.6% of controls. The difference was not statistically significant – a trend favouring HIIT, not proof. Better established: HIIT raises maximal oxygen uptake somewhat more – in one meta-analysis by about 1.2 ml/kg/min more than continuous training (on why that matters, see VO₂max).

Strength training

Strength training preserves muscle, bone and blood-sugar handling. In a meta-analysis of 16 cohort studies, it was associated with a 10–17% lower risk of death, cardiovascular disease, cancer and diabetes; the largest effect was seen at 30–60 minutes a week, with a J-shaped curve beyond that – more did not demonstrably add more. In older adults, progressive resistance training (with gradually increasing load) improves muscle strength markedly and everyday function modestly, according to a Cochrane review of 121 trials. Adequate dietary protein helps (with kidney disease, ask your doctor). A simple strength marker is grip strength. And an ice bath straight after lifting may blunt muscle gains (see cold-water immersion).

Balance and fall prevention

The Cochrane review by Sherrington et al. (2019; 108 trials, 23,407 participants) shows that exercise programmes for older people living in the community reduce the rate of falls by 23% – roughly 195 fewer falls per 1,000 people per year – and the number of people who fall by 15% (about 72 fewer per 1,000). Balance and functional exercises work best, particularly combined with strength exercises. Programmes such as New Zealand's Otago programme follow exactly this principle.

Flexibility, yoga, tai chi

The evidence here is more modest. In the same review, tai chi reduced the rate of falls by 19%. Stretching and yoga alone have been studied far less for hard outcomes; they may help wellbeing and mobility but replace neither strength nor endurance training.

What matters first, for whom

• Beginners and the sedentary: start with walking and break up sitting time (see sitting as a risk). Every bit counts.
• Busy professionals: two short strength sessions plus one or two HIIT sessions achieve a lot in little time; a weekend pattern also counts.
• 65 and over: strength and balance first, on three days a week, then add endurance.
• Prediabetes and type 2 diabetes: combine endurance and strength. In the HART-D trial, only combined training (about 140 minutes a week for nine months) lowered HbA1c – by 0.34 percentage points versus controls; endurance or strength alone did not significantly. More: exercise versus medication, HbA1c.
• High blood pressure: a network meta-analysis of 270 trials (Edwards et al., 2023) found that all forms of training lowered resting blood pressure, isometric training most – static holds such as wall sits or handgrip squeezes – by an average of −8.2/−4.0 mmHg (endurance −4.5/−2.5 mmHg). Typical protocols use four holds of a few minutes with rests, about three times a week. Track it with home measurement; do not stop medication on your own.
• Osteoporosis: targeted resistance and impact training. In the LIFTMOR trial, 101 postmenopausal women with low bone density trained twice a week for 30 minutes for eight months, supervised, with heavy loads (5 × 5 repetitions at over 85% of maximum). Lumbar spine bone density rose by 2.9% and fell by 1.2% in controls.
• Heart disease: after a heart attack, stent or bypass, cardiac rehabilitation is standard. A Cochrane review (85 trials) shows fewer cardiovascular deaths and hospital admissions but no certain reduction in overall mortality. In Germany, doctors can then prescribe rehabilitation sport, for example a cardiac exercise group (Herzsportgruppe, form Muster 56), subject to approval by the statutory health insurer.
• During and after cancer: an international consensus led by the American College of Sports Medicine (ACSM, 2019) recommends endurance and strength training of about 30 minutes, three times a week. It eases fatigue, anxiety and depressive symptoms, improves function and quality of life, and does not worsen lymphoedema. Ground rule: avoid inactivity.
• Knee osteoarthritis: exercise is first-line therapy. The German S2k guideline on knee osteoarthritis (DGOU, 2023 version) states that strength, endurance and flexibility training "shall" be used as primary treatment ("soll", the strongest recommendation grade). A 2024 Cochrane review (139 trials) found improvements versus no exercise of about 13 points for pain and 12.5 for function on a 100-point scale – on average at the border of what patients consider meaningful.

When to see a doctor first

The ACSM's 2015 screening recommendations rest on current activity, known heart, metabolic or kidney disease, symptoms and the intended intensity; risk-factor checklists were dropped. If you are inactive but healthy and symptom-free, you can start at light to moderate intensity without medical clearance and build up gradually. If you are inactive and have such a disease, check with your doctor first. Chest pain or pressure, unusual breathlessness, dizziness, fainting or a racing heart always need assessment – before you start, and if they occur during training.

What this means for you: two example weeks

Examples, not prescriptions – to show how little it takes to begin.

This article is general information and not individual medical advice. Decisions about tests and treatment belong in a conversation with your own physician.