Is the Marcy foldable bike good for back support?

Yes. The high back seat is the main selling point, and owners with back issues say it lets them ride longer than an upright bike. It is not a recliner, so the angle stays fairly upright.

How much weight can it hold?

Marcy rates it at 220 lb. That is lower than most recumbents, so heavier riders should choose a sturdier model.

Does it fold small enough for a closet?

The frame folds to roughly half its length, so it fits in a closet or behind a door. It still takes floor space when folded and is not light to carry up stairs.

Is the resistance hard enough for workouts?

No. The resistance is light and best for casual cardio and rehab-style riding. Riders who want sweat-heavy intervals should look at magnetic recumbents with higher tension.

What do I need to assemble it?

Basic hand tools are enough, and most owners finish in under an hour. The main steps are attaching the stabilizers, seat and console.

Does the console track heart rate?

The console shows basic workout data, but it does not include a chest strap or advanced heart-rate programs. Pair a separate monitor if you need that.