no, haven't tried straps. I'm still a beginner so my lifts haven't gotten heavy enough to necessitate straps. I mainly use gloves to keep callousing down.
Sorry about that. I copied that formula from a different webpage. That formula for based on a "per hour" basis. I updated the post with the formula that allows you to enter any duration.
Based on my math, your workout above comes out to 116 calories.
What would you say is the best approach for tracking HR and calorie burn while weighlifting / strenght training using the built in Workout app on the watch?
I was thinking of going with the "other" setting in the app set to "open goal" and then tracking the workout only while doing the sets (i.e., manually pausing the app between the sets during the rest periods).
For weightlifting I highly recommend pairing your watch with a Bluetooth Chest HRM. Optical HRM don't work well when your blood vessels are constricted; as is the case with weightlifting.