Although you do get some degree of tightening with Active FX, the Deep FX is better able to do this, but both are riskier on the body than on the face.
Patients who have had ActiveFX report tightening of skin in treated areas. For significant skin tightening, DeepFX will be the better treatment modality. Depending on the amount of laxity that needs to be corrected, more than one treatment session may be needed.