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One of the most common questions I receive from clients is, “how hard should I be working out to burn the most calories?” The knee-jerk response would seem to be, “as hard as you can,” but the truth is, there is an “optimal” range for exercising if your goal is to maximize caloric expenditure.
To maximize the number of calories you burn during a cardio session, choose a mode of exercise (running, cycle, rowing machine, etc.) that you enjoy (or are willing to put up with for at least 30 mins), and aim to keep your heart rate at about 65-70% of max heart rate. If you use the RPE Scale (rating of perceived exertion), that would equate to a 14-15 (hard). I tell clients that they should feel “comfortably uncomfortable.”
If your goal is sports conditioning (long-distance running or swimming, for example), then high-volume conditioning will address your specific needs (intensity, duration, etc.). High-volume conditioning is a prolonged session (equal to or greater than 60 mins of continues effort at about 65% of max heart rate (13-14 RPE). This is often referred to as “long, slow training.”
If you are unfamiliar with Rating of Perceived Exertion, use the table below as your guide:
6 – no exertion at all (watching television)
7 – light activity (standing, talking on the phone)
8
9 – very light activity (casual walking)
10
11- light activity (warm-up intensity)
12
13- somewhat hard (you are mildly challenged)
14
15- hard (feels difficult, but you can continue without excessive breathlessness)
16
17- very hard: very demanding (out of breath, you don’t want to stay here for long)
18
19- extremely hard (you CAN’T stay here for long; rigorous)
20- maximal effort (all-out effort, only sustainable for very short bouts, akin to doing plyometric power jumps, all-out sprinting, etc.)
These are only two of the many options for maximizing caloric expenditure. High-intensity interval training, Fartlek, sprint intervals, and high-volume circuit training are others I’ll explain in coming blog posts, so stay tuned!
* Note: Blue Sky Gym and the author disclaim any liability for any injury, physical or emotional, suffered during or as a result of exercise or activities recommended. As always, you should use common sense and consult your health professional before beginning any exercise routine or program.