It motivates me. I love the crescendos in the music - those work particularly well for interval training.
https://www.youtube.com/watch?v=4nXG4Cp-1RI
https://www.youtube.com/watch?v=OX5K2edrpDA
https://www.youtube.com/watch?v=irEv-vdW0LU
https://www.youtube.com/watch?v=4nXG4Cp-1RI
https://www.youtube.com/watch?v=OX5K2edrpDA
https://www.youtube.com/watch?v=irEv-vdW0LU
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