The frequent mistake which happens in this posture is we tend to move forward folding from the mid back. We need to be very mindful here that we hinge from the hip joint. If you feel your glutes and hamstrings are too tight for that - give a bend to your knees. To attain maximum benefit from any posture, very important we strive for right  alignment. 
Any one of you who feel you round ur spine during this practice, refer to the picture below and use the  variation shown and correct your practice

Seated Forward bend

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