Strength/HIIT (CrossFit-style): What It Is, Uses, Evidence & Safety

At a glance

Purpose, evidence and practical considerations.

What it’s for

Strength and aerobic conditioning

What the evidence says

Evidence supports both resistance and aerobic exercise. It does not show that every mixed workout or branded programme is equivalent or best.

Confidence: weak

Practice safety

Technique, load, fatigue and recovery affect injury risk. Adapt movements to experience and health; high-intensity group sessions are not automatically appropriate for a beginner or during illness.

How it works & important distinctions

Resistance work challenges muscles while high-intensity intervals stress aerobic and anaerobic energy systems. The balance varies between sessions.

In these protocols

How people use it, with their schedules, context and original sources.

Rhonda PatrickWeekly training

Date of record:: 2 Feb 2026

~3 hours per week · weekly, when not travelling

Details & sources

Her CrossFit sessions combine strength and high-intensity work. Together with recovery-day running, they make up roughly five hours of weekly exercise.
Source 2 · 2 Feb 2026

Common use

Session and schedule patterns reported in public protocols; these are observations, not instructions. Private and hidden usage is excluded.

Typical session

~3 hours per week1 public entry

Frequency

weekly, when not travelling1 public entry

Other items in these protocols

These share a protocol with this intervention. This does not establish that they work together or are suitable alternatives.

Zone 2 running1×