>live 0.5mi from work
>pay $12/day for parking
i thought i was fuckin lazy. no hate
1. I don't think sprinting will ever make your abs sore. That being said, you shouldn't measure efficacy by soreness. Sprinting/stairs are certainly useful, and will benefit the core, but are not going to lead to soreness.
2. I'd reverse the order here. It's usually best to do strength work first, then end with sprints.