I am a big believer in regular strength training, to the point were I am generally in a worse mode for the day if I can't get a scheduled workout in.

If you want to get started, find a group or a program and jump in. I like nSuns + regular cardio, but the choice is going to depend on age and overall goals. I see my improving PRs and workout sets I've completed as both motivating and addicting.

StrongerbyScience has fantastic guides to most movements, and excellent, peer-reviewed training methodology.