Run stress
How many key sessions you have, whether long runs are controlled, and whether easy runs are actually easy.
Lift/run check
Is the gym helping your marathon block, or stealing from it?
Answer a few questions about your run week, lower-body lifting, long runs, and recovery. Get a first read on whether the load is priced in.
What it checks
The problem is usually the stack, not the gym by itself.
Hard lower-body lifting, marathon-pace work, long-run progression, and mileage growth all live in the same body. This check helps you see whether those pieces are placed well enough to absorb.
Gym stress
How often you lift, how much hard lower-body work is in the week, and whether you are maintaining or chasing PRs.
Placement
Whether the hard lift sits before the key run, before the long run, or far enough away to stop stealing from them.
Interference signs
Flat workouts, heavy legs, long-run fade, lingering soreness, poor sleep, inconsistent fueling, and recent load changes.
The tool
Check the load stack.
This is a first read, not a full plan. Pain, injury, or medical concerns need a qualified professional. Training decisions still depend on the whole athlete.
Use the read
Keep the gym. Respect the marathon.
If the checker shows the week is stacked, the first move is usually placement, priority, or recovery. Not deleting every lift.