I'm assuming you're looking from another browser, in which case if you are logged out you cannot. However I, a random logged in strava user, can see at least so

I'm assuming you're looking from another browser, in which case if you are logged out you cannot. However I, a random logged in strava user, can see at least some of your activities (Last Sept 3) That is easy to change, but again there is the opt-int vs opt-out discussion.