Most of my training is done solo. I do swim with a Masters group 2x/week, but other than that I'm usually on my own. I do like training with other people, but training on my own makes scheduling workouts much easier and I'm not worried about the other people while I follow my program.
Typically for me, getting changed and out the door is the hardest part. Having a group/partner helps with this, so if motivation is difficult for you then peer/group training may be the ticket for you.
<If you're gonna be dumb, you gotta be tough>
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