9 0 5Actions Report Solution This unlocked for me at the end of my third workout. Each workout that I did was 10 minutes long. Scores doesn't matter. Be quick as the chance to get this will expire in 5 days time!Showing all 5 comments. Leave a comment. Just to note: this challenge has a reward, namely free stamps. At the end of my next workout after unlocking the challenge, around 8 stamps were added to my card, automatically filling it and giving me the Rewarding achievement.Posted by MathGuy42 On 25 Nov 13 at 02:54 In the interest of time, I believe this worked for me after doing the 4 minute demo twice and one 10 minute workout.Posted by Big Ell On 27 Nov 13 at 01:54 I just got this achievement this morning, but the stamps were not added to my card and the gift part of the achievement pic still shows as locked (while the achievement itself shows as unlocked). Anyone else run into this problem?Posted by Berk Porter On 27 Nov 13 at 13:17 @Berk Porter: Did you complete another workout after unlocking the Challenge? I did not receive the stamps until the end of my 4th workout.Posted by MathGuy42 On 27 Nov 13 at 13:35 No I only did three. Somehow I missed your earlier comment that it only unlocked after the next workout... I'll try that. Thanks!Posted by Berk Porter On 27 Nov 13 at 14:06 Leave a comment