A couple is taking a break from bicycling.
a couple sit next to their bikes.
Just because a couple is taking a break from bicycling does not mean that they sit next to their bikes.
A couple can take a break without having to sit next to their bikes.
Taking a break can mean engaging in any of many activities other than sitting and if one is sitting one may sit in any location and so couple may not necessarily be sitting next to their bike and it may not be their bikes but rather someone else's bike.