The final four teams on The Amazing Race can officially find themselves within reach of the $1 million, but as they try to ensure a place in the final leg they could run into major obstacles.

Do Matt & Ashley Blame Laura & Tyler For Their Elimination?

Laura and Tyler, Hayley and Blair, Rochelle and Mike and Jenny and Jelani will all remain in Peru on the May 8 episode, and this leg could prove to be the most challenging one they encounter--especially for the usually strong Tyler and Laura.

"It's not over yet," Tyler says to her in a preview clip for the episode.

Fireworks Spark Between Hayley and Blair

The teams may need to use skill sets they weren't expecting this time around, with tasks including carting heavy bricks around, dancing, and paddling extremely non-sturdy boats through the waves crashing into the shores of coastal Trujillo.

"It's going to take strength, stamina and slick dance moves to keep their heads above water," a voice-over teases in the clip.

And though they've been strong in the past, Laura and Tyler, who narrowly beat Matt and Ashley and just missed being eliminated themselves on the prior leg, might be feeling the pressure this time around--especially during the challenge with the bricks.

"This is the hardest physical challenge yet," Tyler says in the clip.

However, the two may overcome the challenges they're facing, after finding themselves renewed by the potential prize awaiting them if they make it to the next leg--and are first to cross the finish line.

"This is for a million dollars," Tyler says.

The Amazing Race airs Fridays at 8 p.m. on CBS.

Tags: The Amazing Race CBS Reality TV