This. Exactly this. Number of activities is not very interesting to compare. As mentioned above, total number of kms, calories burned, time spent or height meters are much more meaningful. A friend that did 15 activities (which could be really anything) while I have done 10 doesn't motivate me. A friend that ran 80 kms while I have 65 kms might just convince me to put those running shoes on again. Please consider this feature.