( CNN ) -- After years of challenging doping accusations -- and two days after giving up that fight -- Lance Armstrong said Saturday that he has no worries and , in fact , feels `` more at ease now than I have in 10 years . '' The native Texan has long been one of the dominant forces in the cycling world , including amassing an unprecedented seven Tour de France titles . But his championship legacy , as well as those prestigious wins , may now be history after Armstrong announced Thursday that he would not participate in what he called a `` one-sided and unfair '' process to challenge doping charges brought against him by the U.S. Anti-Doping Agency . The famed cyclist 's decision prompted the USADA to ban the 40-year-old athlete from competition and strip him of his wins dating to 1998 , though there is a question of whether the organization has the authority to take such action . Your top Armstrong questions answered . Speaking publicly for the first time since announcing his position in a statement , prompting the USADA response , Armstrong insisted he had no worries and was happy and `` focused on the future . '' `` I do n't have anything to worry about , '' he told reporters before Saturday 's start of the two-day Power of Four Mountain Bike Race in Aspen , Colorado . `` I 've got five great kids , I 've got a great lady in my life . I 've got a wonderful foundation that is completely unaffected by any noise out there and we 're going to continue to do our job , '' Armstrong said , referring to his namesake charity that supports cancer patients and research . In February 2011 , Armstrong announced his retirement from professional cycling , though he continued to compete in triathlon events . Then , in June of this year , the USADA said it had filed doping charges against the cyclist -- accusations his attorney blasted as `` wrong '' and `` baseless , '' much like Armstrong has vehemently denied other such claims in the past . The USADA , a quasi-government agency recognized as the official anti-doping agency for Olympic , Pan American and Paralympic sports in the United States , accused Armstrong of using , possessing , trafficking and giving to others performance-enhancing drugs , as well as covering up doping violations . What 's behind the Armstrong headlines ? `` It is a sad day for all of us who love sport and our athletic heroes , '' U.S. Anti-Doping Agency CEO Travis Tygart said in a statement Thursday after Armstrong announced he would no longer cooperate with the agency . `` This is a heartbreaking example of how the win-at-all costs culture of sport , if left unchecked , will overtake fair , safe and honest competition , but for clean athletes , it is a reassuring reminder that there is hope for future generations to compete on a level playing field without the use of performance-enhancing drugs . '' Armstrong has called Tygart 's investigation an `` unconstitutional witch hunt . '' But on Saturday , he made no mention of him , the USADA or performance-enhancing drugs . Rather , the athlete said he felt `` pretty good '' and said it felt `` great to be out here . '' As to the public 's reaction to his decision , Armstrong said that he believes they understand and accept his rationale -- including his desire to focus on other things besides fighting doping allegations . `` I think people understand that we 've got a lot of stuff to do going forward , '' he said . `` That 's what I 'm focused on , and I think people are supportive of that . '' Armstrong 's cancer foundation still strong .
Lance Armstrong participates in a mountain biking competition in Colorado . Hide Caption 8 of 12 Photos:Photos: `` I do n't have anything to worry about , '' he says , insisting he 's at ease with move . An anti-doping agency has accused him of performance-enhancing drug violations .