Wahh, not sure if EX passes now giving out much more freely. My 3 (red/yellow/blue) all kena. 2 at the same location (KKH park) and another one separate (National Museum), but still nearby. Since only 2 phones, so this is ideal setup too hahah.
Hmmmm...think I already kena EX for pretty much all my nearby gyms liaoz. Ie KKH park, Istana, National Museum, Bugis MRT, Nicoll Highway MRT, Red Bus Orchard, Vivo (consider furthest liaoz, but still easily accessible ).
Only left the City Hall area ( St Andrew Cathedral, War Memorial, Tan Kim Seng fountain ) and the GBTB area gyms never kena before