ABC's "Shark Tank" - Season Eight

SHARK TANK - "Episode 820" - Newlyweds and bodybuilders from Dallas, Texas, married strength with glamour and created a fitness apparel line that caters to the woman who loves building her booty; two friends from San Marcos, California, need the Sharks' help to grow their no-spill, portable and stem-less wine glass business; a Ph.D. scientist and big-wave surfer from Honolulu, Hawaii, invented a rescue signal for people that could make the difference between life and death; and two entrepreneurs from New Albany, Ohio, hope to bag some Sharks into a deal with their unique slash-proof and water-resistant backpacks. Also, a follow-up with Erik Hopperstad and Brian Brasch from Fargo, North Dakota, and their business, PRX Performance, which fits home gym equipment into small spaces, which Kevin O'Leary invested in during season seven, on "Shark Tank," airing FRIDAY, APRIL 21 (9:00-10:01 p.m. EDT), on The Disney General Entertainment Content via Getty Images Television Network. (Kelsey McNeal/Disney General Entertainment Content via Getty Images) DAYMOND JOHN, KEVIN O'LEARY, LORI GREINER, ROBERT HERJAVEC