One Quickie

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Filtering an array (NSArray->General)

You can use NSPredicate and -filteredArrayUsingPredicate: to selectively remove stuff from an array.

    NSPredicate *hasZone = [NSPredicate predicateWithBlock:
                                            ^BOOL (id obj, NSDictionary *bindings) {
            GRProfileCueTime *cueTime = obj;
            return cueTime.cue.targetHeartZone != kZoneNone;
        }];
    NSArray *justZones = [cues filteredArrayUsingPredicate: hasZone];

This removes all of the elements of the array that do not have a target heart zone.

If this kind of stuff is useful for you, you might want to check out Mike Ash's collection utilities.