Wall sits

The 2023 BJSM meta-analysis caused a real stir in the exercise-cardiology world because it inverted decades of conventional wisdom. The conventional wisdom said: aerobic exercise is the foundation for BP reduction. The meta-analysis said: by pooled effect size, isometric exercise beats aerobic, dynamic resistance, AND combined modalities. By a lot.

What an isometric is

An isometric exercise is one where the muscle is under load but the joint angle doesn't change. Wall sits, planks, glute bridges held statically, handgrip squeezes. The classic protocol is wall sits.

Why they work for BP

The proposed mechanism is vascular conductance adaptation. The sustained muscle contraction occludes blood flow during the hold; the release creates a reactive hyperemia that, repeated chronically, improves endothelial function and reduces vascular resistance at rest.

Note the word "proposed." The mechanism is still being argued. The outcome is well-replicated.

How they sit in the stack

Wall sits go in at week 1. They're the highest-ROI intervention in the protocol — biggest expected effect, lowest equipment burden, lowest time burden (about 14 minutes including rest, 3x/week). They are also the lever most likely to rank #1 in your personal correlation engine.

If you can only adopt one lever from this entire library, adopt this one.

What the protocol does with it

Specific timing, duration, and progression live in the app — personalized to your training history and your readings. The starting protocol referenced in the published literature is 4 sets of 2 minutes with 2-minute rest between sets, 3 days per week.