Tekashi 6ix9ine Alleged Gym Attackers Enter Front Door, Beeline to Sa

BEFORE THE ATTACK

The men allegedly involved in the brutal beatdown of Tekashi 6ix9ine appeared to have had a plan in place to get to the rapper ... as evidenced in new surveillance footage from the gym.

Check out the video, obtained by TMZ, showing one man already inside the South FL LA Fitness location chatting on his cell phone. The man approaches the front door of the gym to let another man in, and after a brief convo with the front desk employee, they beeline it to the gym's restroom and sauna area joined by a third man.

It certainly looks like the two men were in on some sort of plan ... but it's still unclear if they knew Tekashi was going to be at the gym all along, or if one man possibly saw 6ix9ine and called his buddy to help.

TMZ broke the story, Tekashi was rushed to a hospital Tuesday night after the attack, suffering from injuries to his face, back, ribs and jaw. Sources close to Tekashi tell us he's still receiving treatment in the hospital.

JUMPED AT THE GYM

Video from inside the gym's sauna area shows a group of men punching, kicking and cussing out the rapper for being a snitch.

The rapper's attorney, Lance Lazzaro, tells us he's going to talk to the feds about potentially getting Tekashi some much-needed protection from future attacks.