I basically agree with what Rydra said, and mobility/stretching/foam rolling is awesome, but there's a caveat. Sometimes, if I work out but don't do enough volume,* I feel all antsy for a couple of days. I'd also start screwing up stuff at work. That would happen on upper-body days at my gym (they don't usually program splits, but they were for a few weeks there) when I was otherwise doing heavy volume. It was pretty uncomfortable, so finally I said "fuck it" and started doing extra work to make up the volume, and lo I felt much better. But I think that only applies if you're used to doing lots of volume.
*Volume = sets x reps x weight. My gym has software that adds it up magically for us. It's kind of a rough measure -- the same weight will feel very different with different lifts! -- but it's been really helpful for me. For example, I know my back will get achey after 3,500 lbs of kettlebell swings, regardless of whether it's 200 with the 20 lb bell or 80 with the 44 lb bell.
Oh, and I found this neat rule of thumb for pushups: about 20 incline pushups to a platform at waist height will get you to doing pushups to a platform at knee height. And 20 of those will get you to doing floor push ups. (Source) This seems about right to me.
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*Volume = sets x reps x weight. My gym has software that adds it up magically for us. It's kind of a rough measure -- the same weight will feel very different with different lifts! -- but it's been really helpful for me. For example, I know my back will get achey after 3,500 lbs of kettlebell swings, regardless of whether it's 200 with the 20 lb bell or 80 with the 44 lb bell.
Oh, and I found this neat rule of thumb for pushups: about 20 incline pushups to a platform at waist height will get you to doing pushups to a platform at knee height. And 20 of those will get you to doing floor push ups. (Source) This seems about right to me.