Health - Exercising still good for you. Reverses 20 years of heart age.

 https://www.goodnewsnetwork.org/2-years-of-exercise-reversed-20-years-of-aging-in-the-heart-longest-ever-randomized-trial-on-exercise-showed/

Broken down, it involved specifically two interval training sessions per week, along with one hour of “base pace,” which focused on a fun activity like low to moderate-intensity sports, cycling, or hiking. At peak training load, participants were training 5–6 hours per week, while during the maintenance period of the latter 14 months, that was dropped to about 4 hours, and included the removal of one of the two interval training sessions.