Blend the discomfort with the satisfaction of accomplishment. In other words revel in the rewards for a moment. If you celebrate the victory of so much discomfort you can train your brain to seek it for the pleasure of reward. Rewards can be tiny, it's is not the size of the reward, rather it is the number of rewards. We are reward-seeking so use it to your advantage. Eliminate the obsession with discomfort and turn it into a reward seeking behavior and you work with your own neurology in a positive feedback loop