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Top stocks to watch at the opening session on April 21, 2026. The list highlights the stocks with the biggest gains and declines in recent sessions, according to Vietstock's statistics.

Premium gym chains are entering a “golden era” that is ending or already in decline, as rising operating costs collide with shifting consumer preferences toward more flexible, community-based ways to exercise. Long-term memberships are shrinking, margins are pressured by higher rents and facility expenses, and competition from smaller, more personalized…