Luke 14:33 So likewise, whoever of you does not forsake all that he has cannot be My disciple.

To become a Navy Seal takes some great discipline on the part of the candidates.
A Seal wannabe needs to pass a physical screening test that includes swimming 500 yards in 12.5 minutes or less, followed by a 10-minute rest.
Then do 42 pushups in under two minutes, followed by a two-minute rest.
50 situps in under two minutes, followed by a two-minute rest.
Six pullups, followed by a 10-minute rest.
Run 1.5 miles in less than 11 minutes.
A trainee will need to discipline their mind and body to continue pushing the limits.
Each has to forsake the desire to stop, which their body screams back at them.
It also takes discipline to become a disciple of Christ.
Jesus says you must forsake all.
My body naturally sins but sin is antichrist.
I must forsake what my body and mind want to do naturally and give in to what the Holy Spirit directs me to do.
To become a Seal you push yourself to do certain physical and mental feats.
To be a disciple of Christ you will push yourself to not do things, like sinful behavior.