A nice tool for concentrate a simple barbell curl.
It fixes ellbows for not swing back for move barbell up just with the strength of the bicep.
This makes lil guns really burning and easy looking weights heavy 

Worked now a few weeks with the biceps blaster. 
First it was a lil not comfrtable t training.  It nneds a lil bit time to get used on.  First had to get down at training weight from 25 Kg barbelll to 20 Kg but now i be back on 25 kg and it feels great
Now i really feel every Curl work focused on my lil bicep . So a good ascesoire for bicep training that really helps at get better defition on bicep