Bridge Duty is an isometric workout built on the oldest responsibility aboard any vessel: someone has to stand the watch. Nine stations - squat holds, standing at-ease recoveries, and full plank holds - each held for a 10-count before you move to the next. Nothing dramatic happens on a quiet watch. That's what makes it duty: showing up, holding position, staying alert while absolutely nothing lets you off the hook.

This one works differently from the usual rep-based circuit: it's a flow of nine timed holds, a 10-count each, rotating through three positions. The rotation is the roster. Squat holds appear five times - stations 1, 3, 5, 7 and 9 - the recurring post where the legs log their time at parallel. Two full plank holds at stations 4 and 6 shift the watch to the shoulders and core. And stations 2 and 8 are the change of watch: standing tall, hands behind the back, at ease - which sounds like rest until you realize it's the only recovery on offer, ten counts of it, before the next post. Alternating loaded holds with brief standing resets lets the legs and core accumulate serious isometric time across the set without a single rep being performed - endurance built the way watches are stood, one uneventful count at a time.

Hold every squat at honest parallel with arms extended and weight in the heels - no drifting upward as the count wears on, because drifting on watch is how ships hit things. Keep planks one straight line from head to heels, pressing the floor away. Use the at-ease stations properly: tall posture, shoulders back, breath steady, ready for the next post.

Nothing happened on your watch. That was the assignment, and the legs that held it knew better.

Make it Harder: Extend every hold to a 20-count, including the at-ease stations.

Make it Easier: Halve all holds to a 5-count and take the planks from your knees.