Yes this is what I am looking at....what abilities can we give martials that still compete in the same sphere as high level casters, but still flavor them in a way that feels "physically possible". Finding that line is the key to the exercise.And then there is the "what should a heroic martial look like that strains the definition of mundane into action hero / low tier street superhero range?" I think this is your intention for what you want to discuss out of the OP?
And we don't have to make them exactly equal, its ok if once per day a wizard can do X....and a martial can-do a less ability Y but do it all day. There is a point of balance there. If a caster can teleport 1/day, and a martial can rip through any door like its paper...both serve useful niches.
A martial might have a similar effect to a spell, but it takes significantly longer....however, perhaps it lasts much longer than the spell does as a counterbalance.