Fadi
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The direct answer is no they're not for the weak, unless you consider some of the world's strongest men weak!

When you're lifting really heavy (relative to you) for repetitions, or you're holding a weight statically momentarily before moving it (such in a halting deadlift position with a count), your main target is never your forearm muscles, even though your forearm muscles are involved during the lift.
If you have listened to the camp that passes judgment on you as being weak for using straps, and your grip does fail because you truly believe that using them is cheating, in this instance you've got no one to blame but yourself for not becoming stronger overall as the case ought to be.

There's a difference between a lifter looking for a way out to make his lifts easier, and the Champion lifter who uses (instead of abuses) the straps' availability to his advantage, just like any other tool at his disposal.

When you're lifting really heavy (relative to you) for repetitions, or you're holding a weight statically momentarily before moving it (such in a halting deadlift position with a count), your main target is never your forearm muscles, even though your forearm muscles are involved during the lift.
If you have listened to the camp that passes judgment on you as being weak for using straps, and your grip does fail because you truly believe that using them is cheating, in this instance you've got no one to blame but yourself for not becoming stronger overall as the case ought to be.

There's a difference between a lifter looking for a way out to make his lifts easier, and the Champion lifter who uses (instead of abuses) the straps' availability to his advantage, just like any other tool at his disposal.