Seattle Area Mountaineering Training/Fitness Challenges

I'm trying to formulate goals and training challenges I can do near Seattle. For example, I'd like to be able to climb North Cascades classics in a day, car-to-car. Ultimately I'd like to be able to climb Rainier in a day, car-to-car.

I've heard of a handful of fitness challenges near Seattle like Mt. Si in less than 2 hours with a 30lb pack. I think I heard someone mention Mt Si, Teneriffe Peak, Mailbox Peak in a day? Maybe some kind of traverse up there?

Can anyone share a few classic training/fitness challenges near Seattle?

Thanks!