The honest answer is: less often than you think, and less often as you get stronger. High-Intensity Training fixes intensity at 'to failure', which leaves frequency as the only lever — and that lever should be pulled down, not up, as you progress.
Start conservative
Two full-body sessions per week, with at least two rest days between, is a sensible start. Each session is brief — a handful of compound movements, one working set each. That's enough stimulus for most people to progress for months.
Reduce as you rise
As you get stronger, the intensity of each working set increases — you're pushing more weight to true failure. That demands more recovery. Many HIT trainees reduce frequency over time: from three sessions to two, from two to one every four or five days. The Mentzer method pushed this to its limit, prioritising complete recovery over frequent training.
Let performance decide
The objective test is your logged performance. If progression is climbing, your frequency is right or too low. If it's stalling or regressing, your frequency is too high or recovery is incomplete — add rest. Failure Point reads your logs and tells you when to train again.
A common starting point is two to three full-body sessions per week with at least one rest day between. As intensity rises, many reduce to two, or to one intense session every four to five days.
Should I train every day in HIT?
No. Daily training contradicts HIT's recovery principle. You grow between sessions; training daily compounds fatigue and undermines the high intensity that defines the method.
How do I know if I'm training too often?
Performance is the signal. If your working-set reps and weight stall or regress across sessions, you're training too often (or under-recovering). Add a rest day and reassess.
Failure Point is a training logbook, not medical advice. Training to failure carries injury risk.
Consult a physician before starting any intense training program.