8 weeks is still early stage of recovery...as the others said, don't stress yourself listen to your body.
Myself, I do have this occasionally light aches after a workout till about the 4th month.
The body takes time to heal.
all the best to your road of recovery.
Age:61 PCA: 60 phy fit
04/24/13 PC dx PSA 30.3
06/26/13 biopsy 5 out 10 cores positives
G score: 9
post surgery path
Tumour size:3.6(si)x 3.0(ap)x 4.0cm. 5%
GS: 5+4= 9
Tumour on both lobes peripheral/transitional zones
29 lym nodes, nerve b'dles, sem ves removed
4th wk no pads
6th wk PSA < 0.1
3 Mos PSA < 0.1
4.5Mos PSA <0.1
now focusing on ED