Kingfisher is a strength circuit named for the bird that is all stillness and strike: 10 jumping lunges, 10 calf raises, 3+ push-ups, a 10-count plank hold, 3+ more push-ups, and 3+ up and down planks to finish. Explosive bursts, patient holds, and three separate stations marked with a plus sign daring you to add more.

The kingfisher hunts in two modes - motionless on the branch, then a dive too fast to follow - and the circuit alternates between them the same way. Jumping lunges open in full strike mode, ten airborne switches that tax your legs and heart at once, before calf raises bring things down to something almost meditative. The push-up block then runs strike, stillness, strike: reps, a 10-count hold at the top of the plank, more reps - and the hold is the trap, because push-ups after an isometric arrive on shoulders that never stopped working. The up and down planks close the circuit by making the transition itself the exercise, climbing from elbows to hands and back with your core fighting rotation on every rung. Three stations carry the plus sign, and each one is an invitation to hunt past the minimum while your form still flies straight.

Land jumping lunges softly with the front knee over the toes and switch in the air with control. Pause at the top of each calf raise. Push-ups run full range - chest low, body one straight line - and every plus-sign rep must match the first or it doesn't count. In the plank hold, push the floor away and keep hips level. During up and down planks, place hand where elbow was and move one limb at a time, hips as still as a bird on a branch.

The kingfisher misses most of its dives and goes again anyway. That is what the plus signs are for.

Make it Harder: Set the floor at 5+ for all three plus-sign stations.

Make it Easier: Swap jumping lunges for fast stepping lunges and do the push-up block from your knees.