1. (noun) use of physical or mental energy; hard work

• effort
• elbow grease
• sweat
• travail

1. (noun) use of physical or mental energy; hard work

• application
• diligence
• detrition
• friction
• rubbing
• difficulty
• trouble
• exercise
• exercising
• physical exercise
• physical exertion
• workout
• least effort
• least resistance
• overexertion
• overkill
• pull
• strain
• straining
• struggle
• supererogation

1. (noun) use of physical or mental energy; hard work

• labor
• labour
• toil

1. (noun) use of physical or mental energy; hard work

• dig
• drudge
• fag
• grind
• labor
• labour
• moil
• toil
• travail
• exert