While there are plenty of fancy gadgets you can use to track your effort in the gym or on a run, there’s one core metric that uses no tech at all: the rate of perceived exertion. RPE in the most basic ...

Nobody bothers to track RPE below a six or so ... This can save time in the gym. Most often, a superset involves two lifts done with opposite or unrelated muscles: you can superset a bench ...

There are positives to using a treadmill, including using it any time the gym is open ... the Borg Rating of Perceived Exertion Scale or RPE scale and used heart rate monitors to measure exertion.