What I am saying, I feel is quite realistic.
and not beyond the scope of man, or Apple to test.
When serious sports people go out for a run or a cycle, it's not just down the shops, and they don't cancel their training is there is a cloud in the sky.
They may be out on a 10 or 20 mile run, or a 50 mile cycle.
They don't carry bags with them, wet weather clothing in a rucksack. They are dressed in the minimum sports wear they can be for weight etc etc.
There are the Sports Men and Women, who may wish to buy and wear an Apple sports watch to monitor their performance, and are the very people Apple are hoping to attract.
.........All ok so far are we ?.........