Cross-Training in Your Projection
PIRX counts all your training — cycling, swimming, strength, elliptical, and more — toward your running projection, weighted by how much each type transfers.
PIRX tracks all of your training, not just running. Cycling, swimming, strength work, elliptical sessions, and other activities are factored into your running projection automatically. You do not need to tag or configure anything — synced activities are included from your existing history.
How cross-training counts
Different activities help your running differently, so PIRX weights each type instead of counting all minutes equally:
- Cardio cross-training that raises your heart rate (cycling, swimming, elliptical) builds your aerobic engine. It contributes to your Aerobic Base driver, converted into running-equivalent training load.
- Strength work supports your Running Economy — how efficiently you turn fitness into pace.
- Cycling transfers more to running than running transfers to cycling. The weights are asymmetric and research-based: riding builds a lot of running-applicable aerobic fitness, while swim fitness transfers more modestly to land sports.
What this changes on your dashboard
- Your Projected Time reflects your full training picture. A big week of riding while nursing a running niggle still moves your aerobic base.
- Your Weekly Volume chart shows a cross-training rollup alongside your running distance.
- Your training load (used for Injury Risk and Load Consistency) includes converted cross-training load, so a spike in total volume is visible even when running mileage looks flat.
What it does not do
Cross-training supports your projection — it does not replace running evidence. Your paces, races, and hard running efforts remain the primary signal. An hour on the bike will never count the same as an hour of running; it counts as what the research says it transfers.