I'd say with biking you have an extra plus: no need to go to gym!
I'd ask both places about pay rate and the stability of job (I mean if it's long term kinda or just month or 2). If about the same and you really want to work in stables, then its just the way to go IMO.
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."