Two good ways to program warm-ups, depending on how much guidance your client needs:
Option 1: A Warmup block with individual exercises
Add a Warmup block - in the library's Blocks tab, click + Empty block or drop in the Full-body warmup template - and list each movement as its own exercise. Best when your client benefits from demo videos and per-movement prescriptions:
Hip 90/90 - 2 × 8 e/s
Assault bike - 1 × 3 min · easy zone 2
Use the block note for intent: "Take it slow - focus on opening the hips before loading them." Linking the movements (A1/A2) cycles the client through them as a circuit.
A Warmup block with prescriptions and a note.
Option 2: One "Warm up" exercise with instructions
For self-sufficient clients, create a single exercise called Warm up (or "General warm-up") and put the routine in its description: "5 min: jumping jacks ×20, high knees ×20, leg swings ×10 e/s, two light sets of your first lift." One line in the workout, full instructions one tap away.
The exercise description holds the full routine.
Make it reusable
Either way, save the result: open the Warmup block's ⋯ menu → Save as template, and your warm-up is one click away in every future workout (see Workout & Block Templates).