Exhibit 99.1

Investor Contact: John Heller — 952-229-7427 or ir@lifetimefitness.com

Media Contact: Jason Thunstrom — 952-229-7435 or pr@lifetimefitness.com

FOR IMMEDIATE RELEASE

LIFE TIME FITNESS ANNOUNCES FIRST QUARTER 2013 FINANCIAL RESULTS

Revenue Grew 8.3%, Net Income Grew 9.5% and Diluted EPS was $0.67

CHANHASSEN, Minn. (April 25, 2013) — Life Time Fitness, Inc. (NYSE: LTM), The Healthy Way of Life Company, today reported its financial results for the first quarter ended March 31, 2013.

First quarter 2013 revenue grew 8.3% to $290.7 million from $268.4 million during the same period last year. Net income for the quarter was $28.1 million, or $0.67 per diluted share, compared to net income of $25.7 million, or $0.62 per diluted share, for 1Q 2012.

“We delivered solid revenue, net income and earnings-per-share performance in the first quarter,” said Bahram Akradi, chairman, president and chief executive officer. “Our focus continues to be delivering on our member experience and connectivity objectives, while building our Healthy Way of Life Company and brand. Today, our wide range of interest-driven programs and services, and certified professionals help our members establish personalized health objectives and plans that allow them to achieve real, sustainable results. This has created a differentiated and powerful business model for Life Time that we believe positions us for long-term growth and success.”

In April, the Company opened its first center in Alabama, located in Vestavia Hills. Two additional centers are planned for opening in the second half of 2013, including Montvale, New Jersey and Reston, Virginia. These represent the Company’s third and fourth centers in New Jersey and Virginia, respectively. In 2014, plans call for six new center openings, led by locations in Harrison, New York and Laguna Niguel, California during the first quarter.

- more -

Life Time Fitness First Quarter 2013 Results — Page  2

Three Months Ended March 31, 2013, Financial Highlights:

Total revenue for the first quarter grew 8.3% to $290.7 million from $268.4 million in 1Q 2012.

Total memberships grew 1.5% to 809,813 at March 31, 2013, from 797,640 at March 31, 2012.

Total operating expenses during 1Q 2013 were $238.4 million compared to $220.1 million for 1Q 2012.

Net income for 1Q 2013 was $28.1 million, or $0.67 per diluted share, compared to net income of $25.7 million, or $0.62 per diluted share, for 1Q 2012.

EBITDA for 1Q 2013 was $82.0 million compared to $75.7 million in 1Q 2012.

- more -

Life Time Fitness First Quarter 2013 Results — Page   3

Cash flows from operating activities for 1Q 2013 totaled $76.2 million compared to $73.9 million in 1Q 2012.

Weighted average fully diluted shares for 1Q 2013 totaled 41.6 million compared to 41.7 million in 1Q 2012.

Updated 2013 Business Outlook:

The following statements are based on the Company’s current expectations for fiscal year 2013 and incorporate 2013 operating trends. These 2013 expectations are subject to the risks and uncertainties further described in the Company’s forward-looking statements:

As announced on April 18, 2013, the Company will hold a conference call today at 10:00 a.m. ET to discuss its first quarter 2013 results. Bahram Akradi, Michael Robinson, executive vice president and chief financial officer, and John Heller, senior director, investor relations & treasurer, will host the conference call. The conference call will be webcast and may be accessed via the Company’s Investor Relations section of its website at lifetimefitness.com. A replay of the call will be available the same day via the Company’s website beginning at approximately 2:00 p.m. ET.

Additionally, the Company will hold its Annual Meeting of Shareholders at 2:00 p.m. ET at its headquarters (2902 Corporate Place in Chanhassen, Minnesota). The meeting will be webcast and may be accessed live via the Company’s investor relations section of its website at lifetimefitness.com. A replay of the webcast will be available beginning at approximately 5:00 p.m. ET today, and remain available for 30 days.

# # #

Life Time Fitness First Quarter 2013 Results — Page   4

About Life Time Fitness, Inc.

As The Healthy Way of Life Company, Life Time Fitness (NYSE: LTM) helps organizations, communities and individuals achieve their total health objectives, athletic aspirations and fitness goals by engaging in their areas of interest — or discovering new passions — both inside and outside of Life Time’s distinctive and large sports, professional fitness, family recreation and spa destinations, most of which operate 24 hours a day, seven days a week. The Company’s Healthy Way of Life approach enables customers to achieve this by providing the best programs, people and places of uncompromising quality and value. As of April 25, 2013, the Company operated 106 centers under the LIFE TIME FITNESS^® and LIFE TIME ATHLETIC^® brands in the United States and Canada. Additional information about Life Time centers, programs and services is available at lifetimefitness.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can usually be identified by the use of terminology such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “evolve,” “expect,” “forecast,” “intend,” “looking ahead,” “may,” “opinion,” “plan,” “possible,” “potential,” “project,” “should,” “will” and similar words or expressions. Forward-looking statements are subject to certain risks and uncertainties that could cause the Company’s actual results in the future to differ materially from its historical results and those presently anticipated or projected. Among these factors are attracting and retaining members, risks related to our debt levels and debt covenants, the ability to access our existing credit facility and obtain additional financing, strains on our business from continued and future growth, including potential acquisitions and other strategic initiatives, risks related to maintenance and security of our data, potential recognition of compensation expense related to performance-based stock grants, competition from other health and fitness centers, identifying and acquiring suitable sites for new centers, delays in opening new centers and other factors set forth in the risk factor section of the Company’s annual report on Form 10-K filed with the Securities and Exchange Commission.

The Company cautions investors not to place undue reliance on any such forward-looking statements, which speak only as of the date on which such statements were made. The Company undertakes no obligation to update such statements to reflect events or circumstances arising after such date. All remarks made during the Company’s preliminary financial results webcast will be current at the time of the webcast and the Company is under no obligation to update the recording.

Life Time Fitness First Quarter 2013 Results — Page   5

LIFE TIME FITNESS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands)

Life Time Fitness First Quarter 2013 Results — Page   6

LIFE TIME FITNESS, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands except per share data)

(Unaudited)

Life Time Fitness First Quarter 2013 Results — Page   7

LIFE TIME FITNESS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

Life Time Fitness First Quarter 2013 Results — Page   8

Non-GAAP Financial Measures

This release and the related conference call disclose certain non-GAAP financial measures.

EBITDA. Earnings Before Interest, Income Taxes and Depreciation and Amortization (EBITDA) is a non-GAAP measure consisting of net income plus interest expense, net, provision for income taxes and depreciation and amortization. This term, as the Company defines it, may not be comparable to a similarly titled measure used by other companies and is not a measure of performance presented in accordance with GAAP. The Company uses EBITDA as a measure of operating performance. The funds depicted by EBITDA are not necessarily available for discretionary use if they are reserved for particular capital purposes, to maintain compliance with debt covenants, to service debt or to pay taxes. EBITDA should not be considered as a substitute for net income, net cash provided by operating activities or other income or cash flow data prepared in accordance with GAAP. Additional details related to EBITDA are provided in the Form 8-K that the Company filed with the Securities and Exchange Commission on the date of this press release. The following table provides a reconciliation of net income, the most directly comparable GAAP measure, to EBITDA:

RECONCILIATION OF NET INCOME TO EBITDA

(In thousands)

(Unaudited)

Free Cash Flow. Free cash flow is a non-GAAP measure consisting of net cash provided by operating activities, less purchases of property and equipment, excluding acquisitions. This term, as the Company defines it, may not be comparable to a similarly titled measure used by other companies and does not represent the total increase or decrease in the cash balance presented in accordance with GAAP. The Company uses free cash flow as a measure of cash generated after spending on property and equipment. Free cash flow should not be considered as a substitute for net cash provided by operating activities prepared in accordance with GAAP. Additional details related to free cash flow are provided in the Form 8-K that the Company filed with the Securities and Exchange Commission on the date of this press release. The following table provides a reconciliation of net cash provided by operating activities, the most directly comparable GAAP measure, to free cash flow:

Life Time Fitness First Quarter 2013 Results — Page   9

RECONCILIATION OF NET CASH PROVIDED BY OPERATING ACTIVITIES TO FREE CASH FLOW

(In thousands)

(Unaudited)

9