Personal trainer Janelle Rogers monitors and encourages client Kristin Fritz, 51, of Caledonia, during a session on April 18 in Fritz’s home.

Old-school rules dictate that trainers never touch clients' bare skin with a flat hand (that's why they use those little towels), but not everyone adheres to such mandates.

A well-known personal trainer from Tel Aviv was arrested on Saturday on suspicion of having drugged and raped a client, in a case that is largely being kept under a gag order.