1RM: Abbreviation of “one rep max”. The maximum amount of weight you can do for an exercise only once, WITH PROPER FORM. 

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Basic Disciplines/Phases of Strength Training 
 Adaptation: Getting your body used to it 
 Strength: Increasing the amount of weight you can lift
 Endurance: Increasing how many times you can lift a weight 
 Hypertrophy: Increasing the size of your muscles
 Power: Increasing your ability to exert a lot of force very fast 

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Bodybuilding: Weightlifting sport oriented around increasing muscle size (hypertrophy).

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Bro Science: Popular myths/pseudoscience relating to fitness. Neither exclusive to nor ubiquitous among bros. Generally considered derogatory. Feminine variations exist. 

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Bulk/Bulking: Use of deliberate, controlled caloric surplus, combined with consistent exercise, to gain weight and thus muscle. 
   ”Dirty bulking”: Being less measured about this, either with

    excessive/unmoderated caloric surplus and/or a lot of junk food. A legitimate        strategy for some specialized heavy-build athletes or people who struggle to        put on weight. 

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Cardio Junkie: Someone who does a ton of cardio. Derogatory in some contexts. 

 

Cut/Cutting: Use of a deliberate, controlled caloric deficit, combined with consistent exercise, to lose fat while retaining muscle. 

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Gains: Refers to increase in strength and/or muscle mass.
    Newb/Newbie Gains: The temporary rapid pace of improvement seen by              beginners.

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HIIT: High Intensity Interval Training. A method of advanced cardio training in which maximal effort is alternated with minimal effort/rest. 

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Natty/Natural: Refers to someone (generally a bodybuilder) who does not/claims to not use anabolic drugs. 

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Olympic Lifting: Weightlifting sport in which the goal is to perform compound (multi-movement) lifts to get the maximum weight possible from the ground to above your head. 

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Plyometrics: Advanced form of strength/cardio training, used to increase speed and muscle power.

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Powerlifting: Weightlifting sport in which the goal is to compete to lift the maximum amount possible for bench press, squat, and deadlift. 

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PR: Abbreviation of “personal record”.

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Preworkout: Powdered concoction of stimulants and various other supplements of varying legitimacy and effectiveness. Designed to enhance energy right before a workout. Oversold, but has undeniable utility in some cases. 

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Recomp: Short for “recomposition”; simultaneously losing fat and gaining muscle. Possible mainly for beginners to strength training. 

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Reps/Repetitions: The number of times you lift the weight. 

Sets: A group of repetitions.

Rest: The amount of time you wait in between sets. 

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Skullcrushers: Triceps extensions while lying down, particularly with a barbell.

 

Spot/Spotting: Being ready to assist someone with a lift if they fail. 

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Suicide Grip: Open grip while bench pressing.
 

Work In: To share a piece of equipment with someone by doing your set while they are resting.