Three resistance sessions a week. For ten years.

Why strength specifically

Aerobic exercise (walking, running, cycling) drives cardiovascular and metabolic effects. Strength training drives hormonal and structural effects. Both produce face-record benefits, but the mechanisms are different and the decade-records are visibly distinct.

The under-appreciated finding: past age 40, the face record from sustained strength training tends to outpace the record from sustained aerobic-only exercise. The reason is hormonal.

The hormonal mechanism

Resistance training stimulates:

• Growth hormone (GH) release, particularly during heavy compound lifts
• Testosterone elevation in both sexes (smaller magnitude in females, but meaningful)
• IGF-1 elevation systemically, important for tissue repair
• Improved insulin sensitivity, which reduces glycation effects on collagen

Each of these has face-record consequences:

• GH/IGF-1 → faster skin repair, better collagen maintenance
• Testosterone → more facial fullness, jaw definition
• Insulin sensitivity → less skin glycation, less of the "leathery" texture chronic insulin resistance produces

These effects compound past 40, when the body's baseline production of these hormones starts dropping. A strength-trained 50-year-old typically has hormone levels closer to a sedentary 40-year-old's. The face shows this.

The 10-year record

Compared to a sedentary peer at year 10:

• Visibly fuller face — less of the "deflated" look that sedentary aging produces
• Better jaw and neck definition — postural support transfers visibly
• Skin elasticity tracks 5-10 years younger than chronological in many subjects
• Less visible glycation (less of the "older than you are" leathery texture)

Compared to an aerobic-only peer (e.g., daily walker) at year 10:

• Similar cardiovascular skin tone benefits
• Better facial fullness past 40
• Better jaw definition
• Slightly more lean mass shows in face structure

The combination — strength + aerobic — produces the strongest face record. But if you're choosing one to start past 40, strength training has the steeper benefit curve.

Why it's underrated

Cultural framing around strength training has historically been about either bodybuilding or athletic performance. Neither maps cleanly onto "what 50-year-olds should be doing for their face."

The framing that does work: strength training is the closest behavior we have to a hormone-replacement strategy that doesn't require pharmaceuticals. The hormonal cascade from a heavy compound lift is meaningfully similar to the hormones the body produces less of past 40.

This framing is being slowly absorbed into longevity-focused medicine (Peter Attia, Stuart Phillips, etc.). For face-record purposes, it points to the same conclusion: lifting weights is one of the highest-leverage things you can do past 35-40.

What "3x a week" means specifically

Most strength research converges on 2-4 sessions per week as the productive range, with 3 being the most common recommendation. Each session ~45-60 minutes including warm-up.

Volume: 3-5 compound movements (squat, deadlift, bench press, overhead press, row variants) at 3-5 sets of 5-10 reps each. Progressive load over months.

For face-record purposes specifically, the volume is less important than the consistency. A 3x/week pattern sustained for 10 years beats a 5x/week pattern sustained for 14 months by a wide margin.

Adherence — the hidden variable

Strength training has a higher dropout rate than walking. Going to the gym requires:

• Time commitment (1 hour per session)
• Equipment access (gym membership or home setup)
• Cognitive load (programming, progressive overload tracking)
• Recovery commitment (24-48 hours between sessions for the same muscles)

For 1-person indie founders or busy professionals, this can be the binding constraint. The mitigation:

• Home minimal setup — pull-up bar, adjustable dumbbells, kettlebell. Removes friction.
• Simple program — Stronglifts 5×5, Starting Strength, or any 3-day full-body. Kills cognitive load.
• Schedule binding — same days, same time. Mon/Wed/Fri, 7-8 PM. Surviving a decade requires schedule, not motivation.

How Precog reads strength training

The exercise slot logs sessions and intensity. A strength session reads as "exercise" — not differentiated from cardio in the input. The portrait responds to the volume and consistency, not the type.

The portraits don't distinguish strength-trained vs. aerobic-trained users at the visual level — both produce healthier face records. The mechanism in the model is "active for many years" → better skin, better tone, better facial structure.

For users who want to track strength specifically, the in-app journal note can record session details. The portrait reads the consistency.

The practical close

If you're past 35 and not strength training, the literature is clear that this is the highest-leverage exercise change you can make for face-record reasons. Aerobic stays important; strength becomes more important.

The mirror at year 5 of consistent 3x/week strength training will show a face that ages slower than chronological. The mechanism is real, the literature is solid, and the gap from sedentary peers compounds visibly past 45.