[zopa]

Have a goal, and measure your progress towards that goal. If "get stronger" is enough, great; but if not, find some challenging activity you enjoy and want to improve at, and do the resistance training that will help you get better. Personally I find that much more motivating; just knowing there are health benefits never really did it for me.

Really really important to write down what you do. Progress is not always fast, but if you keep records, you'll see it, and that really helps with motivation.

IMO podcasts and such are not so good for strength training specifically, though for endurance work they're fine. You really want to give full intensity to getting through that last rep (with good form). You're training your ability to push through discomfort as much as you are your muscle's theoretical inherent strength.