expression, adverb, noun which may take the genitive case particle 'no'
beyond one's ability; exceeding one's power; more than one can handle
Used when a task, challenge, or demand is beyond what one can realistically achieve with one's current skill or capacity. Often appears with verbs like 出す, 頑張る, or in negative contexts.
I was given a job beyond my ability, and it was really tough.
I was able to perform beyond my usual ability thanks to everyone's support.
身の丈 means 'one's stature' or 'one's capacity' and is used in similar contexts (e.g., 身の丈に合った生活), but 実力以上 specifically emphasizes exceeding one's actual ability or power.
Compound of 実力 (actual ability) and 以上 (more than, exceeding). The phrase is transparent and follows standard Japanese word formation.