The targets and what counts

US Physical Activity Guidelines, closely aligned with WHO guidance, recommend 150 to 300 minutes a week of moderate-intensity aerobic activity, or 75 to 150 minutes of vigorous activity, or a mix, plus muscle-strengthening activity on two or more days a week.

Two details get lost. There is no minimum bout length, so ten minutes here and there counts fully. And the benefit curve is steepest at the low end — moving from nothing to 60 minutes a week does more for mortality risk than moving from 150 to 300.

  • Moderate — brisk walking, cycling on the flat, doubles tennis, heavy gardening.
  • Vigorous — running, lap swimming, uphill cycling, singles tennis.
  • Talk test — moderate lets you talk but not sing; vigorous limits you to a few words.

Why strength training is not optional

The two-days-a-week strength recommendation carries its own evidence, independent of aerobic activity. Resistance training preserves muscle mass and strength that otherwise decline from midlife, supports bone density, improves insulin sensitivity, and meaningfully reduces fall risk in older adults.

A gym is not required. Bodyweight work, bands, and household loads all count if the last few repetitions are genuinely hard.

  • Cover five patterns: push, pull, squat or sit-to-stand, hinge, and carry.
  • Two sets of 8 to 12 hard repetitions per pattern is a reasonable starting structure.
  • Progress by adding load, repetitions, or better control.
  • Leave at least a day between sessions working the same muscles.

Starting from zero without getting injured

The most common failure is starting at week-twelve volume in week one, getting sore or injured, and stopping. Building gradually — a common rule of thumb is increasing weekly volume by no more than about 10% — works far better.

Walking is undervalued: free, low-injury, easy to scale, and consistently associated with lower mortality, with most of the benefit appearing well below the often-quoted 10,000 steps.

  • Start with 10 minutes a day, five days a week, and add five minutes weekly.
  • Attach it to something existing — after lunch, after the school run.
  • Expect mild muscle soreness for a day or two; sharp joint pain means modify.
  • People with heart disease, recent surgery, or exertional symptoms should get guidance before vigorous activity.

Staying consistent

Over any horizon longer than a few weeks, consistency beats intensity. The strongest predictors of sticking with activity are enjoyment, convenience, and social connection — not willpower.

  • Choose something you would still do on a mediocre day.
  • Schedule sessions like appointments rather than waiting to feel like it.
  • Have a minimum viable session — 10 minutes — for bad days.
  • Track sessions completed, not perfection.
  • Break up long sitting with a couple of minutes of movement every half hour.

On warm-ups: five to ten minutes of easy movement helps. Static stretching beforehand has not been shown to prevent injury and can slightly reduce power, so save it for afterwards.