Resistance training is exercise against an external load. Randomised trials establish gains in strength, everyday physical capacity, bone density, resting blood pressure, blood sugar handling, low mood and anxiety, and arthritic joint pain. Living longer rests only on observing people who already train. Harms are real but bounded: sprains, strains and dropped weights, almost all from unsupervised maximal lifting. (Full Review)

Protocol

Core weekly structure

Two to three whole-body sessions weekly

6–10 multi-joint movements: squat, hinge, push, pull, carry; 2–4 sets, 5–12 repetitions, 1–3 short of failure

Weekly volume target

Roughly 10 hard sets per muscle group weekly

Each additional weekly set adds about 0.37% muscle growth, with returns flattening beyond about 10 sets

Approach A — strength-first heavy loading

Loads above 85% of one-repetition maximum, 3–5 repetitions, long rests

Approach B — moderate-load higher-volume hypertrophy: 65–80% of one-repetition maximum, 8–15 repetitions. Approach C — machine-based low-friction training: one to two sets to near-failure, twice weekly

Time to effect

Strength

2–4 weeks

Largely neural at first; measurable muscle size takes 8–12 weeks

Bone density

6–12 months

Site-specific: bone responds where the load is applied

Blood pressure and blood sugar

8–12 weeks

Both changes emerge over the same window

Benefits

High: Muscular strength and physical function; bone mineral density; resting blood pressure; glycaemic control; depressive and anxiety symptoms; osteoarthritis pain and joint function

Medium: All-cause and cause-specific mortality; visceral and total body fat; sleep quality

Low: Cognitive performance; fall rate in older adults; preservation of brain structure

Speculative: Deceleration of epigenetic ageing markers

Contraindications

Acute decompensated heart failure (New York Heart Association Class IV) or unstable angina, until cleared

Recent myocardial infarction within 90 days, outside supervised cardiac rehabilitation

Uncontrolled resting hypertension at or above 180/110 mmHg, until treated

Aortic root dilation above 4.5 cm, or Marfan or Ehlers-Danlos syndrome, for maximal-load lifting

Proliferative diabetic retinopathy or recent retinal detachment, for breath-holding manoeuvres

Acute rhabdomyolysis or unexplained creatine kinase above five times the upper limit, until resolved

Fluoroquinolone antibiotics (ciprofloxacin, levofloxacin), for heavy loading, during the course and for at least one month afterwards

Key Interactions

Statins (atorvastatin, simvastatin): Caution. Additive muscle injury risk

Corticosteroids (prednisone, dexamethasone): Caution. Impaired gains plus rupture risk

Anticoagulants and antiplatelets (warfarin, apixaban): Caution. Muscle haematoma and bruising

Beta-blockers (metoprolol, carvedilol): Monitor. Heart rate an invalid effort gauge

GLP-1 receptor agonists (semaglutide, tirzepatide): Monitor. Lean mass lost alongside fat

Non-steroidal anti-inflammatory drugs (ibuprofen, naproxen, aspirin): Caution. High-dose habitual use may blunt adaptation

High-dose antioxidant vitamins (vitamin C above 1 g/day, vitamin E above 400 IU/day): Caution. Reduced bone and strength gain

Creatine monohydrate: Beneficial addition at 3–5 g daily

Caffeine and pre-workout stimulants: Caution. Additive pressure surge; below 200 mg where blood pressure is borderline

Protein and leucine supplements: Beneficial addition up to about 1.62 g/kg/day

High-volume endurance training: Monitor. Can blunt strength and hypertrophy gains

Aggressive caloric restriction: Caution. Impaired recovery and lean-mass loss

Risk & Side Effects

High: Musculoskeletal injury; extreme acute blood pressure elevation

Medium: Delayed-onset muscle soreness and temporary strength loss

Low: Increased arterial stiffness; exertional rhabdomyolysis; aortic and coronary artery dissection in predisposed individuals

Speculative: Oxidative and inflammatory cost of sustained excessive volume

Monitoring

Marker	Target	Why
Grip strength (dynamometer)	Above 40 kg men, 27 kg women; stable or rising	Strongest strength predictor of survival
Resting blood pressure	Below 120/80 mmHg	Benefit plus contraindication threshold
HbA1c	4.8–5.4%	Tracks glucose handling of trained muscle
Fasting insulin	2–5 µIU/mL	Detects insulin sensitivity before HbA1c
Creatine kinase (CK)	50–200 IU/L when rested	Flags incomplete recovery and breakdown
Cystatin C-based eGFR	Above 90 mL/min/1.73 m²	Kidney function without muscle-mass artefact
25-hydroxyvitamin D	40–60 ng/mL	Low status blunts muscle and bone response
hs-CRP	Below 1.0 mg/L	Separates training from chronic inflammation
Bone mineral density T-score (scan)	Above −1.0, or improving from own baseline	Site-specific; invisible without imaging
Appendicular lean mass index (scan)	Above 7.0 kg/m² men, 5.5 kg/m² women	Confirms added weight is muscle, not fat

Cadence: Performance anchors every 4 weeks; blood pressure monthly; glycated haemoglobin and lipids at 3 months then every 6–12 months; bone density every 12–24 months. Creatine kinase only when soreness is disproportionate or urine darkens.

Qualitative Assessment

Ease of everyday loaded tasks — carrying shopping, stairs with luggage, rising from the floor unaided
Sleep quality and time to fall asleep on training versus non-training nights
Mood and anxiety, particularly during and after any interruption to training
Recovery between sessions: whether soreness resolves within 72 hours or persists
Joint comfort during and after loading, distinguishing adaptive soreness from sharp or localised pain
Consistency of adherence, which predicts outcomes better than any single programme variable

Resistance Training for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment