Inventory management for Shopify gyms selling retail

The inventory problems gyms selling retail run into

• Variant sprawl in supplements. A single protein line can have 4 flavors in 3 sizes, and members get loyal to one specific combination. Running out of their flavor can feel like a reason to switch gyms.
• Apparel sizing curves. Branded t-shirts, leggings, and hoodies need a size run (XS-XXL) per color per style, and gym-branded gear can't be reordered from a generic supplier if you run out mid-size.
• Small footprint, no back room. Most gym retail is a few shelves or a counter case near the front desk, so you can't hold deep backstock. You need frequent small restocks instead of bulk buying.
• Impulse and convenience items. Grip chalk, lifting straps, shaker bottles, and bars sell in bursts tied to class schedules and challenges, not steady daily volume, making demand lumpy and hard to eyeball.
• Perishable and near-perishable goods. Protein bars, RTD shakes, and some supplements have expiry dates, and gym staff are busy coaching, not checking code dates on a shelf.

Seasonality and demand

January is the big one. New Year resolution members show up and your supplement and apparel sales can spike hard for four to six weeks. Back-to-gym pushes after summer and around September also bump sales. Apparel sees a second lift around the holidays if you sell hoodies or gift-ready items. Bars and RTD drinks tend to sell steadier year-round but still dip in late December when people travel or go off routine. Plan your January order-by dates in November or early December, since overseas apparel suppliers and some supplement brands can take several weeks to fulfill, and you do not want to be waiting on stock when new members walk in.

Suppliers, lead times and minimums

Supplement brands usually sell direct or through regional distributors, often with case pack minimums like 12 units per flavor and sometimes a dollar minimum per order. Domestic brands can turn orders around in a week or two; some popular brands run backorders during January. Apparel is split between print-on-demand style vendors with no minimums and bulk blank or branded suppliers that require a minimum order quantity per style and color, often with longer production time if you need custom logos. Accessories like shaker bottles, chalk, and straps often come from general fitness wholesalers with low case packs and fairly reliable turnaround, though overseas-manufactured items can take several weeks longer.

Worked example

Say your gym sells a chocolate whey protein tub and averages 2 units sold per day. Your supplier's lead time is 10 days and you keep 4 days of safety stock, so your reorder point is 2 x (10 + 4) = 28 units. You want 20 days of cover between orders, you currently have 18 units on hand and 0 on order, so your order quantity is 2 x (10 + 20) - (18 + 0) = 42 units. If the supplier's case pack is 12, you round up to 48 units to avoid leaving 6 short of a full case cycle.

Try it with your own numbers in the reorder point calculator, or size your buffer with the safety stock calculator.

A simple system to start this week

1. List every retail SKU with its variant (flavor, size, color) and tag each with its supplier and case pack size.
2. Set a safety stock number per SKU based on how painful an out-of-stock would be, higher for popular protein flavors, lower for slow-moving accessories.
3. Note expiry dates on perishables like bars and RTDs in a simple spreadsheet, separate from SteadyShelf, and check it monthly.
4. Build your January order calendar backward from your supplier's typical turnaround so stock lands before resolution traffic hits.
5. Review your weekly reorder email every Monday before the front desk team restocks shelves.
6. Confirm received shipments in Shopify right away, including partial deliveries, so your counts stay accurate for the next forecast.

How SteadyShelf fits gyms selling retail

SteadyShelf forecasts each protein flavor, apparel size, and accessory SKU on its own, factors in your January and back-to-school spikes, and tells you when to order from each supplier based on their lead time. It drafts the purchase order and emails it once you approve it, then lets you receive stock, including partial shipments, straight into Shopify. It does not track expiry dates, so for bars and RTD drinks you still need a separate list or spreadsheet to watch code dates and rotate stock.

$29/month flat, unlimited products and suppliers, 30-day free trial.

SteadyShelf is launching on the Shopify App Store. Join early access to get the install link first.

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