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Quick Question About NSFetchRequest and Relationship
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setPredicate:[NSPredicate predicateWithFormat: @"exercise = %@", exercise.name]];
NSEntityDescription *sessionEntity = [NSEntityDescription entityForName:@"Session" inManagedObjectContext:managedObjectContext];
[fetchRequest setEntity:sessionEntity];

NSError *error = nil;
NSArray *results = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
NSLog(@"Fetch error: %@", error);
self.sessionArray = results;

[fetchRequest setPredicate:[NSPredicate predicateWithFormat:"name == %@", exerciseName]];
NSEntityDescription *exerciseEntity = [NSEntityDescription entityForName:@"Exercise" inManagedObjectContext:managedObjectContext];
[fetchRequest setEntity:exerciseEntity];
...
NSArray *results = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
...
NSMutableArray *mutableSessionArray = [NSMutableArray array];
for (Exercise *ex in results) {
    Session *session = [ex exercises];
    if (session) [mutableSessionArray addObject:session];
}
self.sessionArray = [NSArray arrayWithArray:mutableSessionArray];

=, ==
The left-hand expression is equal to the right-hand expression.