Ultra is a running workout for people without a road. Reverse lunges, five blocks of twenty high knees, butt kicks and calf raises interleave into a session built on the endurance runner's formula: keep the legs turning over, and over, and over, long past the point where they would prefer to stop.
The high knees are the mileage - one hundred per set, split into five blocks so the rhythm keeps resetting just as you find it. Everything between them is targeted support work for the running stride. Reverse lunges strengthen the glutes and quads through the same single-leg pattern every running step uses. Butt kicks train the hamstrings to cycle the heel up fast - the recovery phase of a sprint stride. Calf raises give the springs in your lower legs their own dedicated block, because in distance work the calves always fail quietly first. It is a complete gait cycle, disassembled into parts and reassembled at volume.
Drive your knees to hip height and pump your arms in every high knees block - when the height drops, you are jogging in place and fooling nobody. Snap your heels to your glutes on the butt kicks, keeping your knees pointing down. Step the reverse lunges with control rather than rushing; they are the strength anchor of the session, not an interruption to it.
The distance runner's secret is not speed. It is refusing to stop. Set after set - that is the ultra.
Make it Harder: Add a sixth block of twenty high knees to every set.
Make it Easier: March the high knees at full height instead of running them.
