cold immersion: person swims, frozen lake, winter therapy, body rejuvenation, immune system boost, health focus

winter stamina chill discipline resistance wellness vigor toughness therapy lake practice strength renewal rejuvenation circulation cold resilience fortification immunity temperature immersion revitalization detoxification balance strengthening invigoration freezing person bathing recovery water adaptation swimming endurance refreshment nature health purification relaxation vitality shock fitness healing energy hardening frost ice exposure body ai generated