| Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | 38 | 71 | 56 | 103 | 135 | -15 | 46 | 110 | 147 | 174 |
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| Depreciation and amortization | 32 | 32 | 32 | 35 | 44 | 54 | 63 | 124 | 149 | 160 |
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| Amortization of Debt Issuance Costs | 2 | 2 | 2 | 3 | 5 | 6 | 6 | 6 | 5 | 5 |
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| Loss on extinguishment of debt | - | -1 | -0 | -5 | - | - | - | - | - | -2 |
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| Accretion of marketable securities discount | - | - | - | - | - | - | - | - | 3 | 3 |
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| Losses from equity-method investments, net of tax | - | - | - | - | - | - | -0 | -0 | -2 | -4 |
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| Dividends accrued on held-to-maturity investment | - | - | - | - | - | - | 1 | 2 | 2 | 2 |
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| Credit loss (gain) on held-to-maturity investment | - | - | - | - | - | - | 17 | -3 | 3 | 1 |
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| Deferred tax expense | 6 | 16 | 372 | 24 | 22 | 7 | 2 | 49 | 51 | 56 |
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| Loss (gain) on re-measurement of tax benefit arrangement liability | - | -0 | 317 | -5 | -6 | 6 | -12 | 14 | 2 | -1 |
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| (Gain) loss on disposal of property and equipment | 0 | 1 | 0 | -0 | 0 | 0 | 0 | - | - | 1 |
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| Equity-based compensation | 5 | 2 | 3 | 5 | 5 | 5 | 9 | 8 | 8 | 9 |
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| Other | - | - | - | - | - | 0 | 0 | -0 | 0 | -1 |
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| Accounts receivable | 0 | 8 | 10 | 2 | 1 | -24 | 11 | 19 | -5 | 36 |
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| Inventory | 2 | -3 | 1 | 2 | -4 | -0 | 1 | 4 | -1 | 1 |
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| Other assets and other current assets | 6 | 8 | 3 | -6 | 3 | 3 | -8 | 5 | -1 | 12 |
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| Accounts payable and accrued expenses | 0 | 7 | 4 | 15 | -6 | -11 | 31 | -15 | -1 | 17 |
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| Other liabilities and other current liabilities | 0 | 3 | -0 | -3 | 2 | 4 | -3 | 9 | -8 | -1 |
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| Income taxes | 0 | -6 | -3 | 0 | 6 | -4 | 2 | -2 | 2 | 0 |
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| Payments pursuant to tax benefit arrangements | - | -7 | -11 | -30 | -25 | -27 | -0 | -19 | -35 | -45 |
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| Equipment deposits | - | - | - | - | -5 | -2 | 5 | 2 | -4 | -3 |
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| Deferred revenue | - | - | - | - | - | - | - | - | 4 | 3 |
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| Leases | - | - | - | - | - | - | - | 3 | 7 | 13 |
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| Net cash provided by operating activities | - | - | - | 184 | 204 | 31 | 189 | 240 | 330 | 344 |
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| Additions to property and equipment | 19 | 15 | 38 | 41 | 58 | 53 | 54 | 100 | 136 | 155 |
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| Acquisitions of franchisees | - | - | - | 46 | 53 | - | 2 | 425 | 43 | - |
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| Proceeds from sale of property and equipment and insurance proceeds | - | - | - | - | - | - | - | - | - | 1 |
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| Proceeds from Divestiture of Businesses | - | - | - | - | - | - | - | 21 | - | - |
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| Purchases of marketable securities | - | - | - | - | - | - | - | - | 203 | 155 |
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| Maturities of marketable securities | - | - | - | - | - | - | - | - | 80 | 104 |
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| Issuance of note receivable, related party | - | - | - | - | - | - | - | - | - | 2 |
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| Other investments | - | - | - | - | - | - | - | - | 38 | 1 |
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| Net cash used in investing activities | - | - | - | -86 | -111 | -52 | -91 | -507 | -340 | -209 |
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| Proceeds from issuance of long-term debt | - | - | - | - | - | - | - | 900 | - | 800 |
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| Proceeds from Long-Term Lines of Credit | - | - | - | - | - | - | - | 75 | - | - |
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| Proceeds from Issuance of Common Stock | - | 0 | 0 | 1 | 3 | 3 | 8 | 1 | 9 | 22 |
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| Principal payments on capital lease obligations | - | - | - | - | - | 0 | 0 | 0 | 0 | 0 |
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| Repayment of long-term debt and variable funding notes | 15 | 6 | 7 | 712 | 12 | 18 | 18 | 725 | 21 | 609 |
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| Payment of deferred financing and other debt-related costs | 2 | 5 | 1 | 27 | 11 | - | - | 16 | - | 12 |
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| Repurchase and retirement of Class A common stock | - | 2 | - | - | - | - | - | - | 125 | 300 |
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| Payment of share repurchase excise tax | - | - | - | - | - | - | - | - | - | 1 |
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| Distributions to members of Pla-Fit Holdings | 176 | 32 | 11 | 8 | 7 | 2 | 1 | 5 | 5 | 5 |
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| Net cash (used in) provided by financing activities | - | - | - | 110 | 64 | 58 | -10 | 136 | -141 | -105 |
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| Effects of exchange rate changes on cash and cash equivalents | - | - | - | -1 | 1 | 0 | 0 | -1 | 1 | -3 |
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| Net increase (decrease) in cash, cash equivalents and restricted cash | - | - | - | 207 | 159 | 37 | 88 | -131 | -150 | 28 |
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| Cash paid for interest | - | - | - | 39 | 54 | 76 | 75 | 81 | 81 | 91 |
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| Income Taxes Paid, Net | - | - | - | - | - | -2 | 2 | 4 | 5 | 12 |
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| Capital Expenditures Incurred but Not yet Paid | - | - | - | - | - | - | - | - | 19 | 11 |
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| Contribution of Property | - | - | - | - | - | - | - | - | 17 | - |
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| Stock Issued | - | - | - | - | - | - | - | 394 | - | - |
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