I agree with the others - ask, but don't force the issue.
But you can tilt the tables a bit in the favor of 'yes' by:
* picking a nice sunny day to ask
* choose a nice route (eg. in a park)
* making it about health and enjoyment, not about 'losing weight'
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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