karen travers explains at the white house. >> she is a constant presence by her father's son. she is moving into the west wing taking on a formal role in the administration. >> it's my pleasure to welcome such incredible women including my daughter. >> president trump at the white house on monday crediting ivanka for an initiative to help women leaders and entrepreneurs. >> i am blessed to have met so many of you over the course of the last several months and hear your personal stories and journeys. >> ivanka has a west wing office and security clear anness device, but she won't have an official title. unlike her husband, jared kushner an unpaid adviser. she will not be a government employee. but she will voluntarily follow all the edgics ruled placed on government employees. >> she is expected to focus on issues she cares about like paid attorney leave and child car tax credit. >> and she is front and center at every event. and it's unprecedented. >> she is at the white house and have a desk there and be more visible in the west wing i think sends a message that her opinion m

trump is setting up shop in the white house and delving into unprecedented territory and abc's karen travershe white house. >> reporter: she's been a constant presence at her father's side and now ivanka trump moving beyond supportive daughter and into the west wing taking on a formal role in her father's administration. >> it's my pleasure to welcome such incredible women including my daughter. >> reporter: president trump at the white house monday crediting ivanka for helping lead an initiative to help promote women business leaders and entrepreneurs. >> i feel very blessed to have met so many of you over the course of the past several months and hear your personal stories and your journeys. >> reporter: ivanka will now have a west wing office. a security clearance and a government issued communications device. one thing she won't have, an official title. unlike her husband jared kushner who is an unpaid senior adviser to the president ivanka will not be a government employee. but in a statement she said she will, quote, voluntarily follow all of the ethics ruled placed on government emplo

karen travers, abc news. nswer to weight loss? >> one of our colleagues went in to find out. that's next. >> one of our colleagues went in to find out. that's next. ♪ >> the worst song ever. >> awful. just because there are no songs about closets. >> also not a closet. >> chamber. >> all about to make more sense. couple weeks ago we did a story about mara schiavocampo, voluntarily checking herself into a chamber for 24 hours. >> our guy, still in my brain. test a weight loss technique. so did it work? >> reporter: this tiny room is actually the most cutting edge way to measure exactly how many calories your body is burning. i spent a full day locked inside the metabolic chamber at mount sinai hospital in new york. to test some commonly held beliefs about diet and exercise. so we're going to try to learn a lot more about how my body works and what those lessons can teach everybody about how their bodies work. a showdown between good old-fashioned cardio and hiit, high intensity interval training, one of the mos