Terminology...
Overtraining : This is a state when you workout too often resulting in breaking of muscles faster then the body can rebuild it. This results in weak muscles and shows u in negligible or negative gain.
Compound : This are the class of the exercises which work the smaller, larger and stabilizer muscle groups. They are often used for mass gain.
Isolation : This is the classof exercises which works only specific muscles groups. This is employed to remove the unnecessary mass, increase tone at specific regions and get that chiseled look.
Forced Reps : This technique is used in your last sets (one or two) when you've completed your regular reps. Since you won't be able to lift the weight on your own for all the reps, so your partner will help you by giving a little assistance in lifting weights. It may help you developing strength through intensity.
Reps : Means Repetitions. Example : you do 6 reps of bench press in one go. Then rest for a few minutes and again do the 6 reps.
Modified Reps : This is similar ro forced reps in a way that it is done in the last few sets. But here you perform partial reps , ie, you don't lift weights all the way but in a partial range of mothion.
21's : This is a special form of modified reps in which you divide your movement into lower half, upper half and full. All the reps are of seven and thats why its called 21's.
Drop Sets : In drop sets, you do your normal set to failure, then without any rest continue with another failure set with reduced weights and so on until you are comletely exhausted, ie, you are unable to to do a single full set or your normal number of reps.
Super slow : As the name suggests, you do each rep very very slow. For example, while doing biceps curls, you take five seconds for the upward motion, stop for 2 seconds and then take 4 seconds for the downward motion.
Isotension : Flexing the muscles
Giant Sets : You do a series of different exercises without rest. Helps build endurance.
Sets : Specifies how many times you do a number of reps of a particualar exercise. For example, if you do do 6 reps of bench press, then rest for a few minutes and again do the 6 reps. Here you've done 2 sets of 6 reps each.
Failure Sets : With failure sets, you do a particular exercise until you can't do any more reps (in a single set ofcourse).
1rpm, gi, bmi, mid, rdi, rom, target zone, bpm, hiit, rpe, stabilizer, overgrip, undergrip, met, bmr, bmi,