Get fitter, faster
Raise your engine in less time.Keep two quality interval sessions and build an easy aerobic base around them. Both intervals and steady miles raise VO₂max — the mix is what keeps it sustainable.
Your plan at a glance
2–3 interval days
The classic: 4 × 4 minutes hard, 3 minutes easy between.
2 easy base days
Relaxed, conversational sessions to build aerobic depth.
Progress the reps
Add an interval, or a minute of work, as it gets easier.
Respect recovery
Space hard days apart — fitness is built on the rest days.
Worth knowing
Intervals give a small extra edge for VO₂max over steady training — and take less time (Milanović 2015).
How hard should it feel?
Your breath is the simplest intensity meter there is — no heart-rate strap required. Match the effort to the session: easy for warm-ups and recovery, moderate for most of your minutes, and short vigorous bursts when you want to boost fitness.
What a week looks like
Two or three interval days woven into an easy aerobic base, with hard days spaced apart.
Your sample session
The dose above stays the same whichever way you move. Pick your activity and grab a ready-made session to match.
The most accessible cardio there is. Walk briskly for moderate effort; add hills or short fast bursts to push harder. Kind on the joints and easy to keep up.
See the walking session →Efficient and easy to scale — jog gently for base fitness, or add fast intervals to spike it. Build up slowly and mix in walk breaks early on to stay injury-free.
See the running session →Low-impact and interval-friendly, indoors or out. Gentle on the knees, and hills or a turbo trainer make hard efforts easy to dial in exactly.
See the cycling session →Can't do it all? Do a little.
Even short bouts count — three brisk 10-minute walks add up to the same as one 30-minute session. The biggest step is simply starting; build from there.