Absolute strength refers to the total amount of weight you can lift – your 1RM. Relative strength refers to your strength compared to your bodyweight. One of the easiest and most basic test of bodyweight relative strength is chin-up iso-hold.
Standard: Hang from a pull-up bar with your preferred grip (neutral, pronated, or supinated) and your hips slightly piked for 20 seconds.
Advanced version: Do it with only one arm at a time, again trying to hang for at least 20 seconds.
Spend several weeks training chin-up hang cluster-sets. Begin with sets of four 5-second holds and progress to longer holds.