CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'managed',cRay: '91962a5e9beaef74',cH: 'nGB0mLgE0rwWYGTuQLHzyzG.PDxslqzhT4P6MtRoLZg-1740806010-1.2.1.1-3YMz.xYQpDlprFQBHiqKp.YYeTyXuY9IUHhOZLnPBZMJft_MznzegLMrByXItSy3',cUPMDTk: "\/search?q=treadmill.&__cf_chl_tk=n_RF5sfrYrRDC7t5zoSc3sex2ATMB9NfwAeJ1ZQoGzY-1740806010-1.0.1.1-coc9kEZJDH04JaM34zu.3gh675vvTGdxIcxNpI.Uhho",cFPWv: 'b',cITimeS: '1740806010',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=treadmill.&__cf_chl_f_tk=n_RF5sfrYrRDC7t5zoSc3sex2ATMB9NfwAeJ1ZQoGzY-1740806010-1.0.1.1-coc9kEZJDH04JaM34zu.3gh675vvTGdxIcxNpI.Uhho",md: "W6JlbdMuggRtlKjVf6EwEFqypkAkYqE2Z_u3nBLwg0M-1740806010-1.2.1.1-GDkmYQS1DLYdvSOSJ5xZr9r051L6zWVEbOGAPBmwlJVwWiTQsEVfjl.3pm7Y0rU.HlxelzSaaFwBw1YoUhuwmQJdlWeMvBuhzQZgyY84cRrjO3NfR8U.Jyd1BKUQryUI8gNns.oZiK.NVWoaRJWo.iVa8YEikhL344O9jg.ytrTwKyLk6z2hAle1DP1GgNcUoeDFtBqIJfTfMDuLWXRPhNGM6onpmT5NfLXW_PI0c24QMCidxZTiiBs64jDGuhoqV5KfuYK5sC3RG2_ryp8YQQ0aH39Pcmg6Dee5N9eiEddIKMOz9mKMHnjAlvlKakSdYq1vKJUSv7m9fkXlIrOyqsKwsS6uLXCDDnBT1yAIc_3UN4LnTYTjdtriyvMQjHWjtZc3vFWlB2pZTd23pnA7oIaEvyr2OBfEAEgiR8bdzp03pH5lsPAQ_MGAtkXy8UbQGogRN7.rsitIWkhiA2pCmZfKl4qmFzDe6AJ1SOtsxmgYDHQPulb3qdcU3kvt5WlZ0yp58awKFF5KnmsiFUBfmNixPAAGUcjh2HesgvF2QxnqtUevFr_cVPOS.hCkuDTDtMpiMJxSo3kCdKPybWZc8H.kK0vOGAVM6aa0lLyfqbW46k2pnmbxYZJEf01Kk.iXkJ2f_ICJo5IpJSZLLK7ofzAv6gxIMtHjkcnVFvr_KghX.7qzWVNSornxTADu1Si0tRR50agD7h0NRAhV7OaLuIiWvIhcv0_s9sTQmhT92UKIBV9v1OgKDRKEbx39EipPOgsgyUhL2X6AA5Vi2Moa.PYyxJ0Vl91ebjUM2qyoJzcwskGlmN9I1rH2itIchkuF9NQ3NwJ1AqT4YUlmkaLzP1yic4PQVwdM8shjp9aO65uMmBQ4UYR8QoWx5WkgzxbNn999yByUZlMFc1qEyxuByIkwluPVIlwpVOgy4HSMBkkesXkVKCTjbEjZMmRit4fUi4uk9EuOxAgONZnt_yxCBNpehdpti0lCIEOwQyGXZyh_BIfbzNgCGqOxZli9zHsYBKzEQYm5DoRB.g6Up4DEvstgzVWj7jeNjjlRgftKG.8XJinHDbw_0Qk7UQ9eXlnCNVfkoJiFdYM_aLk0b3ps8NLugXvtisZLTOYkHp0lOMPFIfHZabFIk5kE8fm1xLVcZqxI7ccU0KvusgG8BdXTS60xwLFOb8GPId9ZCNj2YTPOYPVdIm3QCkiml5eqCIP4vISfuy4tEMHXyQmmUzDk1aXd2MeKw5jpr.2AMDprBNw",mdrd: "w5p832FhriuZ97B9h.763ABxPZjOX7WdV3E0Llkt2TQ-1740806010-1.2.1.1-_UTIa.MZV1io8r.IpNcq3qvGVJ1_S8d_vlVBxvRwhJx9sX2AnBh4YdwcevxLVFxsO3WGfWIF4c3GELfOclLztT1coFR6ofeL4YrTJCk8vcGtrMUaNrBv_t8YlLJXXDSZ8QY2Kr3fynzZdTJtf7vQ.GUfWZ3lr7.zj_Wif697RtOzBsHfRM0d4vOiQwvlLbId_a8rH9Rb2euevmPYqXLwaWOhODjkTJryC1ZC0vOU7Whe0ASWazBV9oX.jknkkzH5brMu.yC_tAHsb.Hc7vsh4spPrsCpxZXBVscilZn5YkN9yc.m5IihX21XhZxPSEoA7sCr50hr_xU4c_9HarJFVFdwYx.FORKId4VbpiF80RRdsoEYK2UoyHY62zbKW2EWCdXlPpGuBEhursvFvfMQoISZFCJ1MmGrrAAqdQjNGkeft6l6fD8O8QyG0HFKRJ3Ykl0C7PED0z2sXzMJjdlgv.JINsLZzgu8LlNmvB8hGqebqbCKZzejinZOUR2AmPYfCGoGAq.qfBV1Ke.4wVyfw8OVW3h9U0SYJVeBqfseu2JNK7T5sUOzngfNU4YQI6Kru.8PWRYlgCu1iCoW65kzyu8hLGhJ5XKwH14_UlHJKWo.6WYI8ivV.BPpK5mNbDxy_ccMGuKMCbDIBKeCbf3_Q_E7wLkwTfpzRK2Ge2VRACQPQ6ovTBXIY9JFNmc1lMrm00WsGvks5yhLZdV4R7dBjDfEG5mrz0J6eywHAnSZSbeHEJV7Zxasnvb7SGk.UYaRuxcgJCPxg6JlHzx3zKy9Enjpoq4cR9m.f4aLpdhxh3Fl2e2lvWv3uZQW8yh0_7X.hryc78uTVP1cRSDYZWAQDT.78_VPRIq8EJtIUxLl02cemEsB4KF5qs.ce1jEbt4eVU7VzXP57I0o76nfsmr4OLw59p3cYAlowqDkPr.t8ggVeLYq1n0jwbAdLW.a7H6kZVjsgMYoLJdJm.IDaEXtbzaYwN2pYry3tMQ_.GHYRleyopNbsyHSRWjxuZRRox_gUBrsvd_0GHNxDt.Lh28RRp5_7YN5KzFFv9cvR1TkT1IY9xSo0mo7q83d2tzoXmpH3W63ycVEMiF_cj3wVkKuCpjU1qsl3eW.t6fuaFmw6SbVkbS_qvPeCvHH0l8OdCdMxVpdc0loXmW.5nfPaEM0e7DW9zB_WSi5JxbKSvApRfSSIDpUN_g0OO3X8v3EWwZbaqk6v2yYfscicCjBxY8MFkQZsLCsku.24Rk3HbuuSrvoClSx59aXOeSpotEqNPWrNHi0N2FO5a16w5znxpcS7MmBg6aC2hrESjsIENq.pUkkXwBUDdbN_p3LsIeUnmJC2fhoZuyP_caMY_v3C.QvJCpXIP2pKGsgnulTbN9.jD5l6Bcl5mjw2.JmgJn5P_51iHRKr193yBr4NqOmZNxTVx7cwA.xMKf.CT..7LLJUxaYCM6rQolcsPRWdHxs0yUtWI6R7nlc3JrPSPZAJdjZDknaQOtAL7_nYXXeRgaPB9rrqeJXqte6bciy6wuSVQFArIfWDXUgazQIxYyvkE_PDCx4pC7nHU5amQrZ3TenibxrJDzor0wdjCwchGRu6EmTvGrG.2lJ36M8pYdM5asP1xik2BZiUQHcYDeFYnqEhlmVNqi7_x_kDnm3o8Bjxif3TdRYTP9ef6oRxbJENOsgUk8_UqM6tiY01Y_uJTI.jpL.raXKqnr33CxMoe.qPBQDyP5usAAF5ldk9gBLA_QtJ8SkvF4a7STtMejFlTP1W0m6P7fbSENRTy5um6oeznJ38FzA4xLc8IoupSYxJlzfNxJRQHGuvLsFr0rPdGszhcyPAGm1SVDb0768Bgx3q6f1NMMDXX7tsYMQ_G9QtoAIbB3D862R6T4jYuJsWsq6vDtYq23Em7hsL2NT1ECjxPyYEY2P6tF2bO3U8Q4rH6b7NkN9TP3hZAZkYMghhNcG.X5dT8942vOW8xGwQMtbvO9L"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91962a5e9beaef74';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/search?q=treadmill.&__cf_chl_rt_tk=n_RF5sfrYrRDC7t5zoSc3sex2ATMB9NfwAeJ1ZQoGzY-1740806010-1.0.1.1-coc9kEZJDH04JaM34zu.3gh675vvTGdxIcxNpI.Uhho" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>