How much fatigue and risk of injury does the Apex 2 reduce? Do you have data/metrics to measure those?

Reduced Strain, Fatigue, and Injury Risk

In both the laboratory and field testing, the Apex 2 exosuit significantly reduced low back strain and fatigue measured with electromyography (EMG).

For more details and specific numbers please see research papers by Lamers et al. (2018), Lamers et al. (2020), and Yandell et al. (2020). Additionally, check out Science of the Apex.  Reducing muscle strain and fatigue reduces the loading on the muscles, the surrounding soft tissues, and the spine itself. This reduces injury risk.