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    Members training on the main floor at O.N. Athletics 24/7 gym in Groton, CT

    Memberships

    Gym Memberships & Pricing

    24/7 Gym • CrossFit • Personal Training

    More than just a gym.

    O.N. Athletics gives you the flexibility to train independently 24/7, follow coach-led CrossFit programming through CrossFit DYR, or work one-on-one with a personal trainer, all under one roof.

    Most Popular

    24/7 Open Gym

    Starting at $45/month

    Round-the-clock member app access to the full 7,200+ sq. ft. floor: free weights, racks, platforms, machines, cables, cardio, open training area, and sauna. Train independently whenever your schedule allows.

    What open gym includes

    CrossFit DYR Classes

    Starting at $150/month

    Coach-led CrossFit classes for beginners through experienced athletes, scaled person by person. 24/7 open gym access is included, so you can train on your own between classes.

    See how classes run

    Personal Training

    Starting at $70/session

    One-on-one coaching with programming written around your goals. Single sessions and multi-session packages available, with 24/7 gym access included with personal training memberships.

    How training works

    Membership options and pricing vary depending on the level of access and how often you train. Your free intro is the fastest way to find the right fit.

    Military/veteran, first responder, Electric Boat, senior, and family rates are available, ask at your free intro.

    Nutrition coaching, youth athletics, and recovery services are available as add-ons.

    Choose the Best Way to Train

    ✓ = included  ·  — = not included  ·  Uncommon = not typically offered by other gyms in the area

    Comparison of O.N. Athletics membership options against features typically offered by other local gyms
    Feature24/7 Open GymCrossFit ClassesPersonal TrainingOther Local Gyms
    24/7 accessIncludedIncludedIncludedUncommon
    Train independentlyIncludedIncludedIncludedIncluded
    Coach-led trainingNot includedIncludedIncludedUncommon
    Structured programmingNot includedIncludedIncludedUncommon
    Commercial strength equipmentIncludedIncludedIncludedIncluded
    Free weights & barbellsIncludedIncludedIncludedIncluded
    Cardio equipmentIncludedIncludedIncludedIncluded
    CrossFitNot includedIncludedNot includedUncommon
    Group fitness classesNot includedIncludedNot includedUncommon
    Personal training availableIncludedIncludedIncludedUncommon
    Beginner-friendlyIncludedIncludedIncludedIncluded
    Intentionally Limited MembershipIncludedIncludedIncludedNot included
    Train on your scheduleIncludedIncludedIncludedUncommon

    Personal training memberships include 24/7 gym access, so you can train independently outside your scheduled sessions.

    Try Us First

    Not ready to commit? Come experience O.N. Athletics for yourself with a $15 open gym drop-in.

    Get Your $15 Drop-In

    Intentionally Limited Membership

    We deliberately cap membership to help reduce overcrowding and maintain a comfortable training environment with better access to equipment and training space.

    Common Questions

    Membership Questions

    Still Not Convinced?

    We'll make it easy

    Still Not Sure Which One?

    Book a free intro and we’ll help you pick.

    Compare the 24/7 gym in Groton, strength training, CrossFit DYR, and personal training in Groton.

    Find Us

    Come Visit Us

    Address

    800 Flanders Road, Building 9 Unit 5
    Mystic, CT 06355

    Serving Groton, Mystic, Noank, Stonington, New London, Ledyard, Gales Ferry & Southeastern Connecticut

    Directions & Parking

    Off Flanders Road, connecting to Routes 184 and 1, minutes from downtown Mystic and a short run from I-95, Noank, Stonington, New London, and Naval Submarine Base New London. Free on-site parking directly outside the door.

    Get driving directions

    Call or Text

    (860) 415-4909

    Hours

    Open 24 Hours7 Days a Week

    24/7 member access through our member app

    Call or Text