Distance is the major factor in how many calories you burn, not time. So perhaps log it as a 5
K run on the same time as you normally would.
But you are right that it will definitely take extra effort to get over the obstacles.
Barring an HRM, I agree with the suggestion of logging the extra time as calisthenics (for simple obstacles), or circuit training for tough obstacles (like getting over a wall).
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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