New Delhi, April 13 -- Whether you are an elite athlete or someone who simply likes to stay active, a new training term is slowly making its way into the fitness lexicon: "Zone 2 cardio." It may sound technical, but its growing popularity is being fuelled by celebrities and trainers praising it for long-term benefits. In Bollywood, stars like Alia Bhatt and Ranveer Singh are said to favour this approach. In Hollywood, actors such as Chris Hemsworth and Jennifer Aniston have also contributed to the buzz with their "smarter, not harder" fitness routines.

Zone 2 cardio refers to low-to-moderate-intensity exercise where your heart rate stays around 60-70% of your maximum. At this level, you can sustain activity for longer periods while still...