I agree with Nigel.
Also wanted to ask if you are trying to teach a contact heel or just a heel in general? Leerburg has a few videos on contact heeling. Otherwise, depending on the venue, I'm not sure the dog is supposed to touch your leg. I was told AKC rally would penalize me for how Katsu's shoulder bumps into my outer leg while heeling.
+ Kalbi CGC 6/21/2015
+ Blackthorn's Out of the Frying Pan NW1 ORT SEN SCN BCAT SIN RATN TKN (Katsu) 9/12/2017
+ Blackthorn's Skofnung CGC TKN RATI RATO (Steel) 07/23/2018