Binaural beats
Technique
Facilitating sleep and napping during transit between marathon locations (RV, commercial flights)
"I'll be listening to binaural beats and stuff like that when I'm in an RV or maybe if I can on a commercial flight."
More source quotes
Training nervous system resilience by consciously entering parasympathetic states throughout the day
"Whether it was contrast therapy, whether it was PEMF, whether it was binaural beats — I mean, my house had all the gadgets you could imagine, so I was literally training to be an emotional athlete for about three years."